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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nick Desaulniers <ndesaulniers@google.com>,
	Arnd Bergmann <arnd@kernel.org>,
	Tao Zhang <quic_taozha@quicinc.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Sasha Levin <sashal@kernel.org>,
	mathieu.poirier@linaro.org, alexander.shishkin@linux.intel.com,
	nathan@kernel.org, coresight@lists.linaro.org,
	linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev
Subject: [PATCH AUTOSEL 5.19 32/64] coresight: etm4x: avoid build failure with unrolled loops
Date: Sun, 14 Aug 2022 11:24:05 -0400	[thread overview]
Message-ID: <20220814152437.2374207-32-sashal@kernel.org> (raw)
In-Reply-To: <20220814152437.2374207-1-sashal@kernel.org>

From: Nick Desaulniers <ndesaulniers@google.com>

[ Upstream commit 4d45bc82df667ad9e9cb8361830e54fc1264e993 ]

When the following configs are enabled:
* CORESIGHT
* CORESIGHT_SOURCE_ETM4X
* UBSAN
* UBSAN_TRAP

Clang fails assemble the kernel with the error:
<instantiation>:1:7: error: expected constant expression in '.inst' directive
.inst (0xd5200000|((((2) << 19) | ((1) << 16) | (((((((((((0x160 + (i * 4))))) >> 2))) >> 7) & 0x7)) << 12) | ((((((((((0x160 + (i * 4))))) >> 2))) & 0xf)) << 8) | (((((((((((0x160 + (i * 4))))) >> 2))) >> 4) & 0x7)) << 5)))|(.L__reg_num_x8))
      ^
drivers/hwtracing/coresight/coresight-etm4x-core.c:702:4: note: while in
macro instantiation
etm4x_relaxed_read32(csa, TRCCNTVRn(i));
^
drivers/hwtracing/coresight/coresight-etm4x.h:403:4: note: expanded from
macro 'etm4x_relaxed_read32'
read_etm4x_sysreg_offset((offset), false)))
^
drivers/hwtracing/coresight/coresight-etm4x.h:383:12: note: expanded
from macro 'read_etm4x_sysreg_offset'
__val = read_etm4x_sysreg_const_offset((offset));       \
        ^
drivers/hwtracing/coresight/coresight-etm4x.h:149:2: note: expanded from
macro 'read_etm4x_sysreg_const_offset'
READ_ETM4x_REG(ETM4x_OFFSET_TO_REG(offset))
^
drivers/hwtracing/coresight/coresight-etm4x.h:144:2: note: expanded from
macro 'READ_ETM4x_REG'
read_sysreg_s(ETM4x_REG_NUM_TO_SYSREG((reg)))
^
arch/arm64/include/asm/sysreg.h:1108:15: note: expanded from macro
'read_sysreg_s'
asm volatile(__mrs_s("%0", r) : "=r" (__val));                  \
             ^
arch/arm64/include/asm/sysreg.h:1074:2: note: expanded from macro '__mrs_s'
"       mrs_s " v ", " __stringify(r) "\n"                      \
 ^

Consider the definitions of TRCSSCSRn and TRCCNTVRn:
drivers/hwtracing/coresight/coresight-etm4x.h:56
 #define TRCCNTVRn(n)      (0x160 + (n * 4))
drivers/hwtracing/coresight/coresight-etm4x.h:81
 #define TRCSSCSRn(n)      (0x2A0 + (n * 4))

Where the macro parameter is expanded to i; a loop induction variable
from etm4_disable_hw.

When any compiler can determine that loops may be unrolled, then the
__builtin_constant_p check in read_etm4x_sysreg_offset() defined in
drivers/hwtracing/coresight/coresight-etm4x.h may evaluate to true. This
can lead to the expression `(0x160 + (i * 4))` being passed to
read_etm4x_sysreg_const_offset. Via the trace above, this is passed
through READ_ETM4x_REG, read_sysreg_s, and finally to __mrs_s where it
is string-ified and used directly in inline asm.

Regardless of which compiler or compiler options determine whether a
loop can or can't be unrolled, which determines whether
__builtin_constant_p evaluates to true when passed an expression using a
loop induction variable, it is NEVER safe to allow the preprocessor to
construct inline asm like:
  asm volatile (".inst (0x160 + (i * 4))" : "=r"(__val));
                                 ^ expected constant expression

Instead of read_etm4x_sysreg_offset() using __builtin_constant_p(), use
__is_constexpr from include/linux/const.h instead to ensure only
expressions that are valid integer constant expressions get passed
through to read_sysreg_s().

This is not a bug in clang; it's a potentially unsafe use of the macro
arguments in read_etm4x_sysreg_offset dependent on __builtin_constant_p.

Link: https://github.com/ClangBuiltLinux/linux/issues/1310
Reported-by: Arnd Bergmann <arnd@kernel.org>
Reported-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220708231520.3958391-1-ndesaulniers@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hwtracing/coresight/coresight-etm4x.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index 33869c1d20c3..a7bfea31f7d8 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -7,6 +7,7 @@
 #define _CORESIGHT_CORESIGHT_ETM_H
 
 #include <asm/local.h>
+#include <linux/const.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include "coresight-priv.h"
@@ -515,7 +516,7 @@
 	({									\
 		u64 __val;							\
 										\
-		if (__builtin_constant_p((offset)))				\
+		if (__is_constexpr((offset)))					\
 			__val = read_etm4x_sysreg_const_offset((offset));	\
 		else								\
 			__val = etm4x_sysreg_read((offset), true, (_64bit));	\
-- 
2.35.1


WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Nick Desaulniers <ndesaulniers@google.com>,
	Arnd Bergmann <arnd@kernel.org>,
	Tao Zhang <quic_taozha@quicinc.com>,
	Arnd Bergmann <arnd@arndb.de>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Sasha Levin <sashal@kernel.org>,
	mathieu.poirier@linaro.org, alexander.shishkin@linux.intel.com,
	nathan@kernel.org, coresight@lists.linaro.org,
	linux-arm-kernel@lists.infradead.org, llvm@lists.linux.dev
Subject: [PATCH AUTOSEL 5.19 32/64] coresight: etm4x: avoid build failure with unrolled loops
Date: Sun, 14 Aug 2022 11:24:05 -0400	[thread overview]
Message-ID: <20220814152437.2374207-32-sashal@kernel.org> (raw)
In-Reply-To: <20220814152437.2374207-1-sashal@kernel.org>

From: Nick Desaulniers <ndesaulniers@google.com>

[ Upstream commit 4d45bc82df667ad9e9cb8361830e54fc1264e993 ]

When the following configs are enabled:
* CORESIGHT
* CORESIGHT_SOURCE_ETM4X
* UBSAN
* UBSAN_TRAP

Clang fails assemble the kernel with the error:
<instantiation>:1:7: error: expected constant expression in '.inst' directive
.inst (0xd5200000|((((2) << 19) | ((1) << 16) | (((((((((((0x160 + (i * 4))))) >> 2))) >> 7) & 0x7)) << 12) | ((((((((((0x160 + (i * 4))))) >> 2))) & 0xf)) << 8) | (((((((((((0x160 + (i * 4))))) >> 2))) >> 4) & 0x7)) << 5)))|(.L__reg_num_x8))
      ^
drivers/hwtracing/coresight/coresight-etm4x-core.c:702:4: note: while in
macro instantiation
etm4x_relaxed_read32(csa, TRCCNTVRn(i));
^
drivers/hwtracing/coresight/coresight-etm4x.h:403:4: note: expanded from
macro 'etm4x_relaxed_read32'
read_etm4x_sysreg_offset((offset), false)))
^
drivers/hwtracing/coresight/coresight-etm4x.h:383:12: note: expanded
from macro 'read_etm4x_sysreg_offset'
__val = read_etm4x_sysreg_const_offset((offset));       \
        ^
drivers/hwtracing/coresight/coresight-etm4x.h:149:2: note: expanded from
macro 'read_etm4x_sysreg_const_offset'
READ_ETM4x_REG(ETM4x_OFFSET_TO_REG(offset))
^
drivers/hwtracing/coresight/coresight-etm4x.h:144:2: note: expanded from
macro 'READ_ETM4x_REG'
read_sysreg_s(ETM4x_REG_NUM_TO_SYSREG((reg)))
^
arch/arm64/include/asm/sysreg.h:1108:15: note: expanded from macro
'read_sysreg_s'
asm volatile(__mrs_s("%0", r) : "=r" (__val));                  \
             ^
arch/arm64/include/asm/sysreg.h:1074:2: note: expanded from macro '__mrs_s'
"       mrs_s " v ", " __stringify(r) "\n"                      \
 ^

Consider the definitions of TRCSSCSRn and TRCCNTVRn:
drivers/hwtracing/coresight/coresight-etm4x.h:56
 #define TRCCNTVRn(n)      (0x160 + (n * 4))
drivers/hwtracing/coresight/coresight-etm4x.h:81
 #define TRCSSCSRn(n)      (0x2A0 + (n * 4))

Where the macro parameter is expanded to i; a loop induction variable
from etm4_disable_hw.

When any compiler can determine that loops may be unrolled, then the
__builtin_constant_p check in read_etm4x_sysreg_offset() defined in
drivers/hwtracing/coresight/coresight-etm4x.h may evaluate to true. This
can lead to the expression `(0x160 + (i * 4))` being passed to
read_etm4x_sysreg_const_offset. Via the trace above, this is passed
through READ_ETM4x_REG, read_sysreg_s, and finally to __mrs_s where it
is string-ified and used directly in inline asm.

Regardless of which compiler or compiler options determine whether a
loop can or can't be unrolled, which determines whether
__builtin_constant_p evaluates to true when passed an expression using a
loop induction variable, it is NEVER safe to allow the preprocessor to
construct inline asm like:
  asm volatile (".inst (0x160 + (i * 4))" : "=r"(__val));
                                 ^ expected constant expression

Instead of read_etm4x_sysreg_offset() using __builtin_constant_p(), use
__is_constexpr from include/linux/const.h instead to ensure only
expressions that are valid integer constant expressions get passed
through to read_sysreg_s().

This is not a bug in clang; it's a potentially unsafe use of the macro
arguments in read_etm4x_sysreg_offset dependent on __builtin_constant_p.

Link: https://github.com/ClangBuiltLinux/linux/issues/1310
Reported-by: Arnd Bergmann <arnd@kernel.org>
Reported-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20220708231520.3958391-1-ndesaulniers@google.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/hwtracing/coresight/coresight-etm4x.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h b/drivers/hwtracing/coresight/coresight-etm4x.h
index 33869c1d20c3..a7bfea31f7d8 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -7,6 +7,7 @@
 #define _CORESIGHT_CORESIGHT_ETM_H
 
 #include <asm/local.h>
+#include <linux/const.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include "coresight-priv.h"
@@ -515,7 +516,7 @@
 	({									\
 		u64 __val;							\
 										\
-		if (__builtin_constant_p((offset)))				\
+		if (__is_constexpr((offset)))					\
 			__val = read_etm4x_sysreg_const_offset((offset));	\
 		else								\
 			__val = etm4x_sysreg_read((offset), true, (_64bit));	\
-- 
2.35.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-08-14 15:28 UTC|newest]

Thread overview: 82+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-14 15:23 [PATCH AUTOSEL 5.19 01/64] thunderbolt: Change downstream router's TMU rate in both TMU uni/bidir mode Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 02/64] HID: multitouch: new device class fix Lenovo X12 trackpad sticky Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 03/64] PCI: Add ACS quirk for Broadcom BCM5750x NICs Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 04/64] platform/chrome: cros_ec_proto: don't show MKBP version if unsupported Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 05/64] staging: r8188eu: add error handling of rtw_read8 Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 06/64] staging: r8188eu: add error handling of rtw_read16 Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 07/64] staging: r8188eu: add error handling of rtw_read32 Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 08/64] usb: cdns3 fix use-after-free at workaround 2 Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 09/64] usb: cdns3: fix random warning message when driver load Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 10/64] usb: gadget: uvc: calculate the number of request depending on framesize Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 11/64] usb: gadget: uvc: call uvc uvcg_warn on completed status instead of uvcg_info Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 12/64] PCI: aardvark: Fix reporting Slot capabilities on emulated bridge Sasha Levin
2022-08-14 15:23   ` Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 13/64] scsi: ufs: core: Add UFSHCD_QUIRK_BROKEN_64BIT_ADDRESS Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 14/64] scsi: ufs: core: Add UFSHCD_QUIRK_HIBERN_FASTAUTO Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 15/64] irqchip/tegra: Fix overflow implicit truncation warnings Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 16/64] drm/meson: " Sasha Levin
2022-08-14 15:23   ` Sasha Levin
2022-08-14 15:23   ` Sasha Levin
2022-08-14 15:23   ` Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 17/64] clk: ti: Stop using legacy clkctrl names for omap4 and 5 Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 18/64] scsi: ufs: ufs-mediatek: Fix the timing of configuring device regulators Sasha Levin
2022-08-14 15:23   ` Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 19/64] usb: typec: mux: Add CONFIG guards for functions Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 20/64] usb: host: ohci-ppc-of: Fix refcount leak bug Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 21/64] usb: renesas: " Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 22/64] scsi: iscsi: Fix HW conn removal use after free Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 23/64] usb: dwc2: gadget: remove D+ pull-up while no vbus with usb-role-switch Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 24/64] vboxguest: Do not use devm for irq Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 25/64] clk: qcom: ipq8074: dont disable gcc_sleep_clk_src Sasha Levin
2022-08-14 15:23 ` [PATCH AUTOSEL 5.19 26/64] uacce: Handle parent device removal or parent driver module rmmod Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 27/64] zram: do not lookup algorithm in backends table Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 28/64] clk: qcom: clk-alpha-pll: fix clk_trion_pll_configure description Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 29/64] scsi: lpfc: Prevent buffer overflow crashes in debugfs with malformed user input Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 30/64] scsi: lpfc: Fix possible memory leak when failing to issue CMF WQE Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 31/64] gadgetfs: ep_io - wait until IRQ finishes Sasha Levin
2022-08-14 15:24 ` Sasha Levin [this message]
2022-08-14 15:24   ` [PATCH AUTOSEL 5.19 32/64] coresight: etm4x: avoid build failure with unrolled loops Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 33/64] habanalabs: add terminating NULL to attrs arrays Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 34/64] habanalabs/gaudi: invoke device reset from one code block Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 35/64] habanalabs/gaudi: fix shift out of bounds Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 36/64] habanalabs/gaudi: mask constant value before cast Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 37/64] mmc: tmio: avoid glitches when resetting Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 38/64] scsi: ufs: ufs-exynos: Change ufs phy control sequence Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 39/64] pinctrl: intel: Check against matching data instead of ACPI companion Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 40/64] cxl: Fix a memory leak in an error handling path Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 41/64] PCI/ACPI: Guard ARM64-specific mcfg_quirks Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 42/64] um: add "noreboot" command line option for PANIC_TIMEOUT=-1 setups Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 43/64] of: overlay: Move devicetree_corrupt() check up Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 44/64] dmaengine: dw-axi-dmac: do not print NULL LLI during error Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 45/64] dmaengine: dw-axi-dmac: ignore interrupt if no descriptor Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 46/64] mmc: renesas_sdhi: newer SoCs don't need manual tap correction Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 47/64] ACPI: PPTT: Leave the table mapped for the runtime usage Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 48/64] RDMA/rxe: Limit the number of calls to each tasklet Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 49/64] csky/kprobe: reclaim insn_slot on kprobe unregistration Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 50/64] selftests/kprobe: Do not test for GRP/ without event failures Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 51/64] dmaengine: tegra: Add terminate() for Tegra234 Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 52/64] dmaengine: sprd: Cleanup in .remove() after pm_runtime_get_sync() failed Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 53/64] Revert "RDMA/rxe: Create duplicate mapping tables for FMRs" Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 54/64] ARM: 9202/1: kasan: support CONFIG_KASAN_VMALLOC Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-16 14:45   ` Ard Biesheuvel
2022-08-16 14:45     ` Ard Biesheuvel
2022-08-20 14:37     ` Sasha Levin
2022-08-20 14:37       ` Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 55/64] ARM: 9203/1: kconfig: fix MODULE_PLTS for KASAN with KASAN_VMALLOC Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 56/64] openrisc: io: Define iounmap argument as volatile Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 57/64] phy: samsung: phy-exynos-pcie: sanitize init/power_on callbacks Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-14 15:24   ` Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 58/64] md: Notify sysfs sync_completed in md_reap_sync_thread() Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 59/64] md/raid5: Make logic blocking check consistent with logic that blocks Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 60/64] nvmet-tcp: fix lockdep complaint on nvmet_tcp_wq flush during queue teardown Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 61/64] drivers:md:fix a potential use-after-free bug Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 62/64] ext4: avoid remove directory when directory is corrupted Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 63/64] ext4: block range must be validated before use in ext4_mb_clear_bb() Sasha Levin
2022-08-14 15:24 ` [PATCH AUTOSEL 5.19 64/64] ext4: avoid resizing to a partial cluster size Sasha Levin

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