Bug 2347875 (CVE-2022-49366)

Summary: CVE-2022-49366 kernel: ksmbd: fix reference count leak in smb_check_perm_dacl()
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, rhel-process-autobot, vkumar, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-02-26 03:09:48 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ksmbd: fix reference count leak in smb_check_perm_dacl()

The issue happens in a specific path in smb_check_perm_dacl(). When
"id" and "uid" have the same value, the function simply jumps out of
the loop without decrementing the reference count of the object
"posix_acls", which is increased by get_acl() earlier. This may
result in memory leaks.

Fix it by decreasing the reference count of "posix_acls" before
jumping to label "check_access_bits".
Comment 1 Avinash Hanwate 2025-02-26 11:07:30 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022645-CVE-2022-49366-d901@gregkh/T
Comment 2 Avinash Hanwate 2025-02-26 15:32:57 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022645-CVE-2022-49366-d901@gregkh/T