CVE-2022-50272

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

media: dvb-usb: az6027: fix null-ptr-deref in az6027_i2c_xfer()

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 chec

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References