Bug 2348098 (CVE-2022-49191)

Summary: CVE-2022-49191 kernel: mxser: fix xmit_buf leak in activate when LSR == 0xff
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 2025-02-26 03:17:33 UTC 
In the Linux kernel, the following vulnerability has been resolved:

mxser: fix xmit_buf leak in activate when LSR == 0xff

When LSR is 0xff in ->activate() (rather unlike), we return an error.
Provided ->shutdown() is not called when ->activate() fails, nothing
actually frees the buffer in this case.

Fix this by properly freeing the buffer in a designated label. We jump
there also from the "!info->type" if now too.
Comment 1 Avinash Hanwate 2025-02-26 19:15:26 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022616-CVE-2022-49191-ed02@gregkh/T