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Filename Latest commit message Latest commit date
Baisong Zhong 8b256d2336 media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer() 
[ Upstream commit 0ed554fd769a19ea8464bb83e9ac201002ef74ad ]

Wei Chen reports a kernel bug as blew:

general protection fault, probably for non-canonical address
KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]
...
Call Trace:
<TASK>
__i2c_transfer+0x77e/0x1930 drivers/i2c/i2c-core-base.c:2109
i2c_transfer+0x1d5/0x3d0 drivers/i2c/i2c-core-base.c:2170
i2cdev_ioctl_rdwr+0x393/0x660 drivers/i2c/i2c-dev.c:297
i2cdev_ioctl+0x75d/0x9f0 drivers/i2c/i2c-dev.c:458
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fd834a8bded

In az6027_i2c_xfer(), if msg[i].addr is 0x99,
a null-ptr-deref will caused when accessing msg[i].buf.
For msg[i].len is 0 and msg[i].buf is null.

Fix this by checking msg[i].len in az6027_i2c_xfer().

Link: https://lore.kernel.org/lkml/CAO4mrfcPHB5aQJO=mpqV+p8mPLNg-Fok0gw8gZ=zemAfMGTzMg@mail.gmail.com/

Link: https://lore.kernel.org/linux-media/20221120065918.2160782-1-zhongbaisong@huawei.com
Fixes: 76f9a820c8 ("V4L/DVB: AZ6027: Initial import of the driver")
Reported-by: Wei Chen <harperchen1110@gmail.com>
Signed-off-by: Baisong Zhong <zhongbaisong@huawei.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-01-18 11:41:06 +01:00
arch
block
certs
crypto
Documentation spi: Update reference to struct spi_controller 2023-01-18 11:41:01 +01:00
drivers media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer() 2023-01-18 11:41:06 +01:00
fs hfs: Fix OOB Write in hfs_asc2mac 2023-01-18 11:40:59 +01:00
include bonding: Rename slave_arr to usable_slaves 2023-01-18 11:41:05 +01:00
init
ipc
kernel bpf: propagate precision in ALU/ALU64 operations 2023-01-18 11:41:02 +01:00
lib
LICENSES
mm
net bpf: Move skb->len == 0 checks into __bpf_redirect 2023-01-18 11:41:04 +01:00
samples
scripts
security ima: Fix misuse of dereference of pointer in template_desc_init_fields() 2023-01-18 11:41:03 +01:00
sound ASoC: pxa: fix null-pointer dereference in filter() 2023-01-18 11:41:03 +01:00
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.