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dccp: fix bug in updating the GSR

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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 <[email protected]>
Signed-off-by: Gerrit Renker <[email protected]>
This commit is contained in:
Samuel Jero 2010-12-30 12:15:41 +01:00 • committed by Gerrit Renker
commit 763dadd47c
1 changed files with 2 additions and 1 deletions
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3
net/dccp/dccp.h
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@ -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);
/*