On Mon, Aug 28, 2023 at 10:21:07AM -0300, Wander Lairson Costa wrote:

The xt_u32 module doesn't validate the fields in the xt_u32 structure.
An attacker may take advantage of this to trigger an OOB read by setting
the size fields with a value beyond the arrays boundaries.

Add a checkentry function to validate the structure.

This was originally reported by the ZDI project (ZDI-CAN-18408).

Applied to nf, thanks