In the Linux kernel, the following vulnerability has been resolved: dmaengine: atxdmac: avoid nullprtderef in atxdmacprepdmamemset The atxdmacmemsetcreatedesc may return NULL, which will lead to a null pointer dereference. For example, the len input is error, or the atchan->freedescs_list is empty and memory is exhausted. Therefore, add check to avoid this.