5.5

CVE-2022-50272

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

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 checking msg[i].len in az6027_i2c_xfer().
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.34 < 4.9.337
Linux ≫ Linux Kernel Version >= 4.10 < 4.14.303
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.270
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.229
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.163
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.86
Linux ≫ Linux Kernel Version >= 5.16 < 6.0.16
Linux ≫ Linux Kernel Version >= 6.1 < 6.1.2
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.15% 0.045
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/2b6a8a1a32746981044e7ab06649c804acb4068a
Patch
https://git.kernel.org/stable/c/c712d1ccbfb787620422b437a5b8fac0802547bd
Patch
https://git.kernel.org/stable/c/7abfe467cd685f5da7ecb415441e45e3e4e2baa8
Patch
https://git.kernel.org/stable/c/8b256d23361c51aa4b7fdb71176c1ca50966fb39
Patch
https://git.kernel.org/stable/c/559891d430e3f3a178040c4371ed419edbfa7d65
Patch
https://git.kernel.org/stable/c/210fcf64be4db82c0e190e74b5111e4eef661a7a
Patch
https://git.kernel.org/stable/c/6fbc44731a4665cbe92a5090e9804a388a72214b
Patch
https://git.kernel.org/stable/c/6b60cf73a931af34b7a0a3f467a79d9fe0df2d70
Patch
https://git.kernel.org/stable/c/0ed554fd769a19ea8464bb83e9ac201002ef74ad
Patch