From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Nathan Chancellor <natechancellor@gmail.com>,
Arnd Bergmann <arnd@arndb.de>,
Julian Wiedmann <jwi@linux.ibm.com>,
"David S. Miller" <davem@davemloft.net>,
Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.9 23/51] s390: ctcm: fix ctcm_new_device error return code
Date: Wed, 15 May 2019 12:55:58 +0200 [thread overview]
Message-ID: <20190515090623.961966830@linuxfoundation.org> (raw)
In-Reply-To: <20190515090616.669619870@linuxfoundation.org>
[ Upstream commit 27b141fc234a3670d21bd742c35d7205d03cbb3a ]
clang points out that the return code from this function is
undefined for one of the error paths:
../drivers/s390/net/ctcm_main.c:1595:7: warning: variable 'result' is used uninitialized whenever 'if' condition is true
[-Wsometimes-uninitialized]
if (priv->channel[direction] == NULL) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/s390/net/ctcm_main.c:1638:9: note: uninitialized use occurs here
return result;
^~~~~~
../drivers/s390/net/ctcm_main.c:1595:3: note: remove the 'if' if its condition is always false
if (priv->channel[direction] == NULL) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../drivers/s390/net/ctcm_main.c:1539:12: note: initialize the variable 'result' to silence this warning
int result;
^
Make it return -ENODEV here, as in the related failure cases.
gcc has a known bug in underreporting some of these warnings
when it has already eliminated the assignment of the return code
based on some earlier optimization step.
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/net/ctcm_main.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index ad17fc5883f61..e22b9ac3e564f 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -1595,6 +1595,7 @@ static int ctcm_new_device(struct ccwgroup_device *cgdev)
if (priv->channel[direction] == NULL) {
if (direction == CTCM_WRITE)
channel_free(priv->channel[CTCM_READ]);
+ result = -ENODEV;
goto out_dev;
}
priv->channel[direction]->netdev = dev;
--
2.20.1
next prev parent reply other threads:[~2019-05-15 11:14 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-15 10:55 [PATCH 4.9 00/51] 4.9.177-stable review Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 01/51] netfilter: compat: initialize all fields in xt_init Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 02/51] bpf: fix struct htab_elem layout Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 03/51] bpf: convert htab map to hlist_nulls Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 04/51] platform/x86: sony-laptop: Fix unintentional fall-through Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 05/51] USB: serial: fix unthrottle races Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 06/51] iio: adc: xilinx: fix potential use-after-free on remove Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 07/51] libnvdimm/namespace: Fix a potential NULL pointer dereference Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 08/51] HID: input: add mapping for Expose/Overview key Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 09/51] HID: input: add mapping for keyboard Brightness Up/Down/Toggle keys Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 10/51] HID: input: add mapping for "Toggle Display" key Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 11/51] libnvdimm/btt: Fix a kmemdup failure check Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 12/51] s390/dasd: Fix capacity calculation for large volumes Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 13/51] mac80211: fix unaligned access in mesh table hash function Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 14/51] s390/3270: fix lockdep false positive on view->lock Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 15/51] mISDN: Check address length before reading address family Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 16/51] x86/reboot, efi: Use EFI reboot for Acer TravelMate X514-51T Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 17/51] KVM: x86: avoid misreporting level-triggered irqs as edge-triggered in tracing Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 18/51] tools lib traceevent: Fix missing equality check for strcmp Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 19/51] init: initialize jump labels before command line option parsing Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 20/51] selftests: netfilter: check icmp pkttoobig errors are set as related Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 21/51] ipvs: do not schedule icmp errors from tunnels Greg Kroah-Hartman
2019-05-15 10:55 ` [PATCH 4.9 22/51] MIPS: perf: ath79: Fix perfcount IRQ assignment Greg Kroah-Hartman
2019-05-15 10:55 ` Greg Kroah-Hartman [this message]
2019-05-15 10:55 ` [PATCH 4.9 24/51] drm/sun4i: Set device driver data at bind time for use in unbind Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 25/51] selftests/net: correct the return value for run_netsocktests Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 26/51] gpu: ipu-v3: dp: fix CSC handling Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 27/51] spi: Micrel eth switch: declare missing of table Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 28/51] spi: ST ST95HF NFC: " Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 29/51] Input: synaptics-rmi4 - fix possible double free Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 30/51] cw1200: fix missing unlock on error in cw1200_hw_scan() Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 31/51] ALSA: pcm: remove SNDRV_PCM_IOCTL1_INFO internal command Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 32/51] rtlwifi: rtl8723ae: Fix missing break in switch statement Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 33/51] Dont jump to compute_result state from check_result state Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 34/51] Revert "x86/vdso: Drop implicit common-page-size linker flag" Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 35/51] Revert "x86: vdso: Use $LD instead of $CC to link" Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 36/51] x86: vdso: Use $LD instead of $CC to link Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 37/51] x86/vdso: Drop implicit common-page-size linker flag Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 38/51] x86/vdso: Pass --eh-frame-hdr to the linker Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 39/51] powerpc/64s: Include cpu header Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 40/51] bridge: Fix error path for kobject_init_and_add() Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 41/51] fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied Greg Kroah-Hartman
2019-05-19 15:43 ` Nathan Chancellor
2019-05-19 20:27 ` Florian Westphal
2019-05-20 2:00 ` Hangbin Liu
2019-05-20 0:11 ` Sasha Levin
2019-05-20 0:29 ` David Ahern
2019-05-20 9:04 ` Greg Kroah-Hartman
2019-05-20 9:11 ` Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 42/51] net: ucc_geth - fix Oops when changing number of buffers in the ring Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 43/51] packet: Fix error path in packet_init Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 44/51] vlan: disable SIOCSHWTSTAMP in container Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 45/51] vrf: sit mtu should not be updated when vrf netdev is the link Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 46/51] ipv4: Fix raw socket lookup for local traffic Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 47/51] bonding: fix arp_validate toggling in active-backup mode Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 48/51] drivers/virt/fsl_hypervisor.c: dereferencing error pointers in ioctl Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 49/51] drivers/virt/fsl_hypervisor.c: prevent integer overflow " Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 50/51] powerpc/lib: fix book3s/32 boot failure due to code patching Greg Kroah-Hartman
2019-05-15 10:56 ` [PATCH 4.9 51/51] powerpc/booke64: set RI in default MSR Greg Kroah-Hartman
2019-05-15 18:27 ` [PATCH 4.9 00/51] 4.9.177-stable review kernelci.org bot
2019-05-15 19:54 ` Naresh Kamboju
2019-05-16 3:34 ` Guenter Roeck
2019-05-16 11:00 ` Jon Hunter
2019-05-16 14:09 ` shuah
2019-05-17 6:33 ` Kelsey Skunberg
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