wifi: ath12k: Decrement TID on RX peer frag setup error handling

jira LE-4395
cve CVE-2025-39761
Rebuild_History Non-Buildable kernel-6.12.0-55.39.1.el10_0
commit-author Karthikeyan Kathirvel <[email protected]>
commit 7c0884f

Currently, TID is not decremented before peer cleanup, during error
handling path of ath12k_dp_rx_peer_frag_setup(). This could lead to
out-of-bounds access in peer->rx_tid[].

Hence, add a decrement operation for TID, before peer cleanup to
ensures proper cleanup and prevents out-of-bounds access issues when
the RX peer frag setup fails.

Found during code review. Compile tested only.

	Signed-off-by: Karthikeyan Kathirvel <[email protected]>
	Signed-off-by: Sarika Sharma <[email protected]>
	Reviewed-by: Vasanthakumar Thiagarajan <[email protected]>
Link: https://patch.msgid.link/[email protected]
	Signed-off-by: Jeff Johnson <[email protected]>
(cherry picked from commit 7c0884f)
	Signed-off-by: Jonathan Maple <[email protected]>

Author: PlaidCat

drivers/net/wireless/ath/ath12k/dp.c

@@ -79,6 +79,7 @@ int ath12k_dp_peer_setup(struct ath12k *ar, int vdev_id, const u8 *addr)
 	ret = ath12k_dp_rx_peer_frag_setup(ar, addr, vdev_id);
 	if (ret) {
 		ath12k_warn(ab, "failed to setup rx defrag context\n");
+		tid--;
 		goto peer_clean;
 	}