CVE-2022-49376 Information

Description

In the Linux kernel the following vulnerability has been resolved:

scsi: sd: Fix potential NULL pointer dereference

If sd_probe() sees an early error before sdkp->device is initialized sd_zbc_release_disk() is called. This causes a NULL pointer dereference when sd_is_zoned() is called inside that function. Avoid this by removing the call to sd_zbc_release_disk() in sd_probe() error path.

This change is safe and does not result in zone information memory leakage because the zone information for a zoned disk is allocated only when sd_revalidate_disk() is called at which point sdkp->disk_dev is fully set resulting in sd_disk_release() being called when needed to cleanup a disk zone information using sd_zbc_release_disk().

Reference

https://git.kernel.org/stable/c/05fbde3a77a4f1d62e4c4428f384288c1f1a0be5 https://git.kernel.org/stable/c/0fcb0b131cc90c8f523a293d84c58d0c7273c96f https://git.kernel.org/stable/c/3733439593ad12f7b54ae35c273ea6f15d692de3 https://git.kernel.org/stable/c/78f8e96df06e2d04d82d4071c299b59d28744f47 https://git.kernel.org/stable/c/c1f0187025905e9981000d44a92e159468b561a8