From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org,
Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
syzbot <syzbot+ae590932da6e45d6564d@syzkaller.appspotmail.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
Subject: [PATCH 4.9 30/32] PM / hibernate: Fix oops at snapshot_write()
Date: Mon, 16 Jul 2018 09:36:38 +0200 [thread overview]
Message-ID: <20180716073508.208481961@linuxfoundation.org> (raw)
In-Reply-To: <20180716073504.433996952@linuxfoundation.org>
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
commit fc14eebfc20854a38fd9f1d93a42b1783dad4d17 upstream.
syzbot is reporting NULL pointer dereference at snapshot_write() [1].
This is because data->handle is zero-cleared by ioctl(SNAPSHOT_FREE).
Fix this by checking data_of(data->handle) != NULL before using it.
[1] https://syzkaller.appspot.com/bug?id=828a3c71bd344a6de8b6a31233d51a72099f27fd
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reported-by: syzbot <syzbot+ae590932da6e45d6564d@syzkaller.appspotmail.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
kernel/power/user.c | 5 +++++
1 file changed, 5 insertions(+)
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -186,6 +186,11 @@ static ssize_t snapshot_write(struct fil
res = PAGE_SIZE - pg_offp;
}
+ if (!data_of(data->handle)) {
+ res = -EINVAL;
+ goto unlock;
+ }
+
res = simple_write_to_buffer(data_of(data->handle), res, &pg_offp,
buf, count);
if (res > 0)
next prev parent reply other threads:[~2018-07-16 7:43 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-16 7:36 [PATCH 4.9 00/32] 4.9.113-stable review Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 01/32] nvme: validate admin queue before unquiesce Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 02/32] MIPS: Call dump_stack() from show_regs() Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 03/32] MIPS: Use async IPIs for arch_trigger_cpumask_backtrace() Greg Kroah-Hartman
2018-07-16 9:29 ` 陈华才
2018-07-16 9:40 ` [PATCH " Greg Kroah-Hartman
2018-07-16 9:46 ` [PATCH 4.9 03/32] MIPS: Use async IPIs forarch_trigger_cpumask_backtrace() 陈华才
2018-07-16 10:46 ` Greg Kroah-Hartman
2018-07-16 18:34 ` Greg Kroah-Hartman
2018-07-17 6:53 ` [PATCH 4.9 03/32] MIPS: Use async IPIsforarch_trigger_cpumask_backtrace() 陈华才
2018-07-17 7:20 ` Greg Kroah-Hartman
2018-07-17 8:14 ` [PATCH 4.9 03/32] MIPS: Use asyncIPIsforarch_trigger_cpumask_backtrace() 陈华才
2018-07-16 7:36 ` [PATCH 4.9 04/32] MIPS: Fix ioremap() RAM check Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 05/32] mmc: dw_mmc: fix card threshold control configuration Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 06/32] ibmasm: dont write out of bounds in read handler Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 07/32] ata: Fix ZBC_OUT command block check Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 08/32] ata: Fix ZBC_OUT all bit handling Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 09/32] vmw_balloon: fix inflation with batching Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 10/32] ahci: Disable LPM on Lenovo 50 series laptops with a too old BIOS Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 11/32] USB: serial: ch341: fix type promotion bug in ch341_control_in() Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 12/32] USB: serial: cp210x: add another USB ID for Qivicon ZigBee stick Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 13/32] USB: serial: keyspan_pda: fix modem-status error handling Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 14/32] USB: yurex: fix out-of-bounds uaccess in read handler Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 15/32] USB: serial: mos7840: fix status-register error handling Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 16/32] usb: quirks: add delay quirks for Corsair Strafe Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 17/32] xhci: xhci-mem: off by one in xhci_stream_id_to_ring() Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 18/32] HID: usbhid: add quirk for innomedia INNEX GENESIS/ATARI adapter Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 19/32] Fix up non-directory creation in SGID directories Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 20/32] ALSA: hda - Handle pm failure during hotplug Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 21/32] fs, elf: make sure to page align bss in load_elf_library Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 22/32] tools build: fix # escaping in .cmd files for future Make Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 23/32] i2c: tegra: Fix NACK error handling Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 24/32] iw_cxgb4: correctly enforce the max reg_mr depth Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 25/32] nvme-pci: Remap CMB SQ entries on every controller reset Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 26/32] uprobes/x86: Remove incorrect WARN_ON() in uprobe_init_insn() Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 27/32] netfilter: nf_queue: augment nfqa_cfg_policy Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 28/32] netfilter: x_tables: initialise match/target check parameter struct Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 29/32] loop: add recursion validation to LOOP_CHANGE_FD Greg Kroah-Hartman
2018-07-16 7:36 ` Greg Kroah-Hartman [this message]
2018-07-16 7:36 ` [PATCH 4.9 31/32] RDMA/ucm: Mark UCM interface as BROKEN Greg Kroah-Hartman
2018-07-16 7:36 ` [PATCH 4.9 32/32] loop: remember whether sysfs_create_group() was done Greg Kroah-Hartman
2018-07-16 13:55 ` [PATCH 4.9 00/32] 4.9.113-stable review Nathan Chancellor
2018-07-17 7:00 ` Greg Kroah-Hartman
2018-07-16 16:25 ` Guenter Roeck
2018-07-16 16:31 ` Greg Kroah-Hartman
2018-07-16 16:41 ` Guenter Roeck
2018-07-16 17:43 ` Greg Kroah-Hartman
2018-07-16 18:02 ` Guenter Roeck
2018-07-16 18:31 ` Greg Kroah-Hartman
2018-07-16 18:33 ` Greg Kroah-Hartman
2018-07-16 19:37 ` Guenter Roeck
2018-07-17 7:00 ` Greg Kroah-Hartman
2018-07-17 8:05 ` Naresh Kamboju
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