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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-56767
• https://git.kernel.org/stable/c/54376d8d26596f98ed7432a788314bb9154bf3e3
• https://git.kernel.org/stable/c/c43ec96e8d34399bd9dab2f2dc316b904892133f
• https://git.kernel.org/stable/c/e658f1c133b854b2ae799147301d82dddb8f3162
• https://git.kernel.org/stable/c/fdba6d5e455388377ec7e82a5913ddfcc7edd93b
• https://git.kernel.org/stable/c/3d229600c54e9e0909080ecaf1aab0642aefa5f0
• https://git.kernel.org/stable/c/8d364597de9ce2a5f52714224bfe6c2e7a29b303
• https://git.kernel.org/stable/c/ed1a8aaa344522c0c349ac9042db27ad130ef913