diff options
author | Eric Dumazet <edumazet@google.com> | 2016-11-02 07:53:17 -0700 |
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committer | David S. Miller <davem@davemloft.net> | 2016-11-03 15:33:30 -0400 |
commit | ac9e70b17ecd7c6e933ff2eaf7ab37429e71bf4d (patch) | |
tree | 781677be717b11066e303449ee4abd787048816e /net/ipv4/tcp.c | |
parent | 9512925a2cc2b1cd0206bb93bad200a69716f998 (diff) | |
download | linux-ac9e70b17ecd7c6e933ff2eaf7ab37429e71bf4d.tar.gz |
tcp: fix potential memory corruption
Imagine initial value of max_skb_frags is 17, and last skb in write queue has 15 frags. Then max_skb_frags is lowered to 14 or smaller value. tcp_sendmsg() will then be allowed to add additional page frags and eventually go past MAX_SKB_FRAGS, overflowing struct skb_shared_info. Fixes: 5f74f82ea34c ("net:Add sysctl_max_skb_frags") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Hans Westgaard Ry <hans.westgaard.ry@oracle.com> Cc: HÃ¥kon Bugge <haakon.bugge@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/tcp.c')
-rw-r--r-- | net/ipv4/tcp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 3251fe71f39f..18238ef8135a 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -1241,7 +1241,7 @@ new_segment: if (!skb_can_coalesce(skb, i, pfrag->page, pfrag->offset)) { - if (i == sysctl_max_skb_frags || !sg) { + if (i >= sysctl_max_skb_frags || !sg) { tcp_mark_push(tp, skb); goto new_segment; } |