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authorSamuel Jero <sj323707@ohio.edu>2010-12-30 14:15:41 +0300
committerGerrit Renker <gerrit@erg.abdn.ac.uk>2011-01-07 14:22:43 +0300
commit763dadd47c884853a22f2f19ea27e58431303ff3 (patch)
tree9ee3daff6fe649578d3fabdc0a1fcf8252b7b660 /net
parent2cf5be93d1b704f342ad423a49f0e78d73939e66 (diff)
downloadlinux-763dadd47c884853a22f2f19ea27e58431303ff3.tar.xz
dccp: fix bug in updating the GSR
Currently dccp_check_seqno allows any valid packet to update the Greatest Sequence Number Received, even if that packet's sequence number is less than the current GSR. This patch adds a check to make sure that the new packet's sequence number is greater than GSR. Signed-off-by: Samuel Jero <sj323707@ohio.edu> Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Diffstat (limited to 'net')
-rw-r--r--net/dccp/dccp.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/net/dccp/dccp.h b/net/dccp/dccp.h
index 45087052d894..5fdb07229017 100644
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -426,7 +426,8 @@ static inline void dccp_update_gsr(struct sock *sk, u64 seq)
{
struct dccp_sock *dp = dccp_sk(sk);
- dp->dccps_gsr = seq;
+ if (after48(seq, dp->dccps_gsr))
+ dp->dccps_gsr = seq;
/* Sequence validity window depends on remote Sequence Window (7.5.1) */
dp->dccps_swl = SUB48(ADD48(dp->dccps_gsr, 1), dp->dccps_r_seq_win / 4);
/*