Bug 2327178 (CVE-2024-50277)

Summary: CVE-2024-50277 kernel: dm: fix a crash if blk_alloc_disk fails
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2327242    
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Description OSIDB Bzimport 2024-11-19 02:02:04 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dm: fix a crash if blk_alloc_disk fails

If blk_alloc_disk fails, the variable md->disk is set to an error value.
cleanup_mapped_device will see that md->disk is non-NULL and it will
attempt to access it, causing a crash on this statement
"md->disk->private_data = NULL;".
Comment 1 Avinash Hanwate 2024-11-19 05:37:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024111936-CVE-2024-50277-1fe3@gregkh/T