CVE-2024-47739: padata: use integer wrap around to prevent deadlock on seq_nr overflow

In the Linux kernel, the following vulnerability has been resolved:

padata: use integer wrap around to prevent deadlock on seqnr overflow

When submitting more than 2^32 padata objects to padatadoserial, the current sorting implementation incorrectly sorts padata objects with overflowed seqnr, causing them to be placed before existing objects in the reorder list. This leads to a deadlock in the serialization process as padatafindnext cannot match padata->seqnr and pd->processed because the padata instance with overflowed seqnr will be selected next.

To fix this, we use an unsigned integer wrap around to correctly sort padata objects in scenarios with integer overflow.

— NVD

This CVE was automatically created from a reference found in an email or other text. If you are reading this, then this CVE entry is probably erroneous, since this text should be replaced by the official CVE description automatically.

— Launchpad