Bug 2347964 (CVE-2022-49376)

Summary: CVE-2022-49376 kernel: scsi: sd: Fix potential NULL pointer dereference
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's SCSI subsystem. A NULL pointer dereference can be triggered when an error occurs before the sdkp->device object is fully initialized, causing a system crash and a denial of service.
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Description OSIDB Bzimport 2025-02-26 03:12:52 UTC 
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().
Comment 3 Avinash Hanwate 2025-02-27 22:49:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022646-CVE-2022-49376-9ec1@gregkh/T