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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 <chamas@h4.dion.ne.jp>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ken-ichirou MATSUZAWA 2015-08-28 16:05:20 +09:00 committed by David S. Miller
parent 0a6a3a23ea
commit 7084a31589
1 changed files with 2 additions and 2 deletions
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4
net/netlink/af_netlink.c
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@ -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)