Description
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.
Product status
da97a80a657d1b1b50ef633e8ff5dbf0d417fc8d (git) before 5d2146889fad4cb9e6c13e790d4cfd871486eca8
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before 6acf8597c5b04f455ee0649e11e5f3bcd28f381e
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before 34d17b39bceef25e4cf9805cd59250ae05d0a139
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before d85b5247a79355b8432bfd9ac871f96117f750d4
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before c46db6088bccff5115674d583fef46ede80077a2
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before 28dc61cc49c6e995121c6d86bef4b73df78dda80
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before b5de1eac71fec1af7723f1083d23a24789fd795c
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before 85a5660491b507d33662b8e81c142e6041e642eb
233ed09d7fdacf592ee91e6c97ce5f4364fbe7c0 (git) before 11fa7fefe3d8fac7da56bc9aa3dd5fb3081ca797
f78b54e7d83c7879f9a6e49e6724019ca34177cc (git)
d79d7d5c878809964da537336dad5ff55fa1605e (git)
4.12
Any version before 4.12
4.9.337 (semver)
4.14.303 (semver)
4.19.270 (semver)
5.4.229 (semver)
5.10.163 (semver)
5.15.86 (semver)
6.0.16 (semver)
6.1.2 (semver)
6.2 (original_commit_for_fix)
References
git.kernel.org/...c/5d2146889fad4cb9e6c13e790d4cfd871486eca8
git.kernel.org/...c/6acf8597c5b04f455ee0649e11e5f3bcd28f381e
git.kernel.org/...c/34d17b39bceef25e4cf9805cd59250ae05d0a139
git.kernel.org/...c/d85b5247a79355b8432bfd9ac871f96117f750d4
git.kernel.org/...c/c46db6088bccff5115674d583fef46ede80077a2
git.kernel.org/...c/28dc61cc49c6e995121c6d86bef4b73df78dda80
git.kernel.org/...c/b5de1eac71fec1af7723f1083d23a24789fd795c
git.kernel.org/...c/85a5660491b507d33662b8e81c142e6041e642eb
git.kernel.org/...c/11fa7fefe3d8fac7da56bc9aa3dd5fb3081ca797
