netlink: mmap: fix lookup frame position

__netlink_lookup_frame() was always called with the same "pos" value in netlink_forward_ring(). It will look at the same ring entry header over and over again, every time through this loop. Then cycle through the whole ring, advancing ring->head, not "pos" until it equals the "ring->head != head" loop test fails. Signed-off-by: Ken-ichirou MATSUZAWA <[email protected]> Signed-off-by: David S. Miller <[email protected]>
ambv · Aug 29, 2015 · 7084a31 · 7084a31
1 parent 0a6a3a2
commit 7084a31
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c
@@ -611,11 +611,11 @@ static void netlink_increment_head(struct netlink_ring *ring)
 
 static void netlink_forward_ring(struct netlink_ring *ring)
 {
-	unsigned int head = ring->head, pos = head;
+	unsigned int head = ring->head;
 	const struct nl_mmap_hdr *hdr;
 
 	do {
-		hdr = __netlink_lookup_frame(ring, pos);
+		hdr = __netlink_lookup_frame(ring, ring->head);
 		if (hdr->nm_status == NL_MMAP_STATUS_UNUSED)
 			break;
 		if (hdr->nm_status != NL_MMAP_STATUS_SKIP)