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xfrm: Fix esn sequence number diff calculation in xfrm_replay_notify_esn() 

Commit 0017c0b "xfrm: Fix replay notification for esn." is off by one
for the sequence number wrapped case as UINT_MAX is 0xffffffff, not
0x100000000. ;)

Just calculate the diff like done everywhere else in the file.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Mathias Krause 2013-03-20 22:59:11 +01:00 committed by Steffen Klassert
parent 0017c0b575
commit 799ef90c55
1 changed files with 2 additions and 4 deletions
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6
net/xfrm/xfrm_replay.c
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@ -359,14 +359,12 @@ static void xfrm_replay_notify_esn(struct xfrm_state *x, int event)
if (replay_esn->seq_hi == preplay_esn->seq_hi)
seq_diff = replay_esn->seq - preplay_esn->seq;
else
seq_diff = UINT_MAX - preplay_esn->seq
+ replay_esn->seq;
seq_diff = ~preplay_esn->seq + replay_esn->seq + 1;
if (replay_esn->oseq_hi == preplay_esn->oseq_hi)
oseq_diff = replay_esn->oseq - preplay_esn->oseq;
else
oseq_diff = UINT_MAX - preplay_esn->oseq
+ replay_esn->oseq;
oseq_diff = ~preplay_esn->oseq + replay_esn->oseq + 1;
if (seq_diff < x->replay_maxdiff &&
oseq_diff < x->replay_maxdiff) {