CVE-2022-50282

Summary

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

chardev: fix error handling in cdev_device_add()

While doing fault injection test, I got the following report:

————[ cut here ]———— kobject: '(null)' (0000000039956980): is not initialized, yet kobject_put() is being called. WARNING: CPU: 3 PID: 6306 at kobject_put+0x23d/0x4e0 CPU: 3 PID: 6306 Comm: 283 Tainted: G W 6.1.0-rc2-00005-g307c1086d7c9 #1253 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:kobject_put+0x23d/0x4e0 Call Trace: <TASK> cdev_device_add+0x15e/0x1b0 __iio_device_register+0x13b4/0x1af0 [industrialio] __devm_iio_device_register+0x22/0x90 [industrialio] max517_probe+0x3d8/0x6b4 [max517] i2c_device_probe+0xa81/0xc00

When device_add() is injected fault and returns error, if dev->devt is not set, cdev_add() is not called, cdev_del() is not needed. Fix this by checking dev->devt in error path.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxda97a80a657d1b1b50ef633e8ff5dbf0d417fc8d < 5d2146889fad4cb9e6c13e790d4cfd871486eca8affected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < 6acf8597c5b04f455ee0649e11e5f3bcd28f381eaffected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < 34d17b39bceef25e4cf9805cd59250ae05d0a139affected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < d85b5247a79355b8432bfd9ac871f96117f750d4affected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < c46db6088bccff5115674d583fef46ede80077a2affected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < 28dc61cc49c6e995121c6d86bef4b73df78dda80affected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < b5de1eac71fec1af7723f1083d23a24789fd795caffected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < 85a5660491b507d33662b8e81c142e6041e642ebaffected
LinuxLinux233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 < 11fa7fefe3d8fac7da56bc9aa3dd5fb3081ca797affected
LinuxLinuxf78b54e7d83c7879f9a6e49e6724019ca34177ccaffected
LinuxLinuxd79d7d5c878809964da537336dad5ff55fa1605eaffected
LinuxLinux4.9.224 < 4.9.337affected
LinuxLinux3.16.83 < 3.17affected
LinuxLinux4.4.224 < 4.5affected
LinuxLinux4.12affected
LinuxLinux0 < 4.12unaffected
LinuxLinux4.9.337 <= 4.9.*unaffected
LinuxLinux4.14.303 <= 4.14.*unaffected
LinuxLinux4.19.270 <= 4.19.*unaffected
LinuxLinux5.4.229 <= 5.4.*unaffected
LinuxLinux5.10.163 <= 5.10.*unaffected
LinuxLinux5.15.86 <= 5.15.*unaffected
LinuxLinux6.0.16 <= 6.0.*unaffected
LinuxLinux6.1.2 <= 6.1.*unaffected
LinuxLinux6.2 <= *unaffected

Weaknesses

References