Description
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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
e15d1c12c5878b3a80d6573af1721e17264e0286 to < dcf632bca424e6ff8c8eb89c96694e7f05cd29b6affectede15d1c12c5878b3a80d6573af1721e17264e0286 to < 3c67f49a6643d973e83968ea35806c7b5ae68b56affectede15d1c12c5878b3a80d6573af1721e17264e0286 to < 3715c5e9a8f96b6ed0dcbea06da443efccac1eccaffectede15d1c12c5878b3a80d6573af1721e17264e0286 to < 1634b7adcc5bef645b3666fdd564e5952a9e24e0affected
Linux Linux
Default version status: affected
3.18affected0 to < 3.18unaffected5.15.113 to ≤ 5.15.*unaffected6.1.30 to ≤ 6.1.*unaffected6.3.4 to ≤ 6.3.*unaffected6.4 to ≤ *unaffected