Bug 2348242 (CVE-2021-47645)

Summary: CVE-2021-47645 kernel: media: staging: media: zoran: calculate the right buffer number for zoran_reap_stat_com
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 03:22:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

media: staging: media: zoran: calculate the right buffer number for zoran_reap_stat_com

On the case tmp_dcim=1, the index of buffer is miscalculated.
This generate a NULL pointer dereference later.

So let's fix the calcul and add a check to prevent this to reappear.
Comment 1 Avinash Hanwate 2025-02-26 19:58:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025022648-CVE-2021-47645-ab28@gregkh/T