Bug 2426014 (CVE-2023-54284)

Summary: CVE-2023-54284 kernel: media: av7110: prevent underflow in write_ts_to_decoder()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-12-30 13:02:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

media: av7110: prevent underflow in write_ts_to_decoder()

The buf[4] value comes from the user via ts_play().  It is a value in
the u8 range.  The final length we pass to av7110_ipack_instant_repack()
is "len - (buf[4] + 1) - 4" so add a check to ensure that the length is
not negative.  It's not clear that passing a negative len value does
anything bad necessarily, but it's not best practice.

With the new bounds checking the "if (!len)" condition is no longer
possible or required so remove that.
Comment 1 Alexander B 2025-12-31 15:39:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025123027-CVE-2023-54284-a3a6@gregkh/T