Bug 2343168 (CVE-2025-21679)

Summary: CVE-2025-21679 kernel: btrfs: add the missing error handling inside get_canonical_dev_path
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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Description OSIDB Bzimport 2025-01-31 12:01:30 UTC 
In the Linux kernel, the following vulnerability has been resolved:

btrfs: add the missing error handling inside get_canonical_dev_path

Inside function get_canonical_dev_path(), we call d_path() to get the
final device path.

But d_path() can return error, and in that case the next strscpy() call
will trigger an invalid memory access.

Add back the missing error handling for d_path().
Comment 1 Pedro Sampaio 2025-01-31 18:41:31 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025013102-CVE-2025-21679-f980@gregkh/T