CVE-2026-53338net: airoha: Add NULL check for of_reserved_mem_lookup() in airoha_qdma_init_hfwd_queues()

Official description

In the Linux kernel, the following vulnerability has been resolved: net: airoha: Add NULL check for of_reserved_mem_lookup() in airoha_qdma_init_hfwd_queues() of_reserved_mem_lookup() may return NULL if the reserved memory region referenced by the "memory-region" phandle is not found in the reserved memory table (e.g. due to a misconfigured DTS or a removed memory-region node). The current code dereferences the returned pointer without checking for NULL, leading to a kernel NULL pointer dereference at the following lines: dma_addr = rmem->base; // line 1156 num_desc = div_u64(rmem->size, buf_size); // line 1160 Add a NULL check after of_reserved_mem_lookup() and return -ENODEV if the lookup fails, which is consistent with the existing error handling for of_parse_phandle() failure in the same code block.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/01f7d4b504580664d36faea5671cde5e3f0d8a5b
• https://git.kernel.org/stable/c/cdb96c42db7b256348f9b57718debfaa4bca6b39
• https://git.kernel.org/stable/c/f9f25118faa4dd2b6e3d14a03d123bbdbd59925d