Bug 2395255 (CVE-2023-53244)

Summary: CVE-2023-53244 kernel: media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-09-15 15:03:28 UTC 
In the Linux kernel, the following vulnerability has been resolved:

media: pci: tw68: Fix null-ptr-deref bug in buf prepare and finish

When the driver calls tw68_risc_buffer() to prepare the buffer, the
function call dma_alloc_coherent may fail, resulting in a empty buffer
buf->cpu. Later when we free the buffer or access the buffer, null ptr
deref is triggered.

This bug is similar to the following one:
https://git.linuxtv.org/media_stage.git/commit/?id=2b064d91440b33fba5b452f2d1b31f13ae911d71.

We believe the bug can be also dynamically triggered from user side.
Similarly, we fix this by checking the return value of tw68_risc_buffer()
and the value of buf->cpu before buffer free.
Comment 1 Keith Grant 2025-09-15 18:48:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091501-CVE-2023-53244-197d@gregkh/T