Bug 2335902 (CVE-2024-56767)

Summary: CVE-2024-56767 kernel: dmaengine: at_xdmac: avoid null_prt_deref in at_xdmac_prep_dma_memset
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 2025-01-06 17:02:05 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dmaengine: at_xdmac: avoid null_prt_deref in at_xdmac_prep_dma_memset

The at_xdmac_memset_create_desc may return NULL, which will lead to a
null pointer dereference. For example, the len input is error, or the
atchan->free_descs_list is empty and memory is exhausted. Therefore, add
check to avoid this.
Comment 1 Robb Gatica 2025-01-06 18:26:25 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025010656-CVE-2024-56767-420f@gregkh/T