On Fri, Dec 12, 2025 at 08:17:43PM +0530, Deepanshu Kartikey wrote:

How about limiting num_keys to 64K (1u << 16)? In practice, PR keys
are used for shared storage coordination and typical deployments have
only a handful of hosts, so this should be more than enough for any
realistic use case.

With a bounded num_keys, the SIZE_MAX check becomes unnecessary, so
I've removed it. Also switched to kvzalloc/kvfree to handle larger
allocations gracefully.

Something like below:

+/* Limit the number of keys to prevent excessive memory allocation */
+#define PR_KEYS_MAX_NUM (1u << 16)

Looks reasonable to me.  Stefan?