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l2tpv3: fix cookie decoding 

If a 32 bits l2tpv3 frame cookie MSB if set to 1, the cast to uint64_t
cookie will spread 1 to the four most significant bytes.
Then the condition (cookie != s->rx_cookie) becomes false.

Signed-off-by: Alexis Dambricourt <alexis.dambricourt@gmail.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Alexis Dambricourt 2016-01-05 00:26:07 +01:00 committed by Jason Wang
parent aa7f9966df
commit 3be9b3528d
1 changed files with 1 additions and 1 deletions
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2
net/l2tpv3.c
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@ -325,7 +325,7 @@ static int l2tpv3_verify_header(NetL2TPV3State *s, uint8_t *buf)
if (s->cookie_is_64) {
cookie = ldq_be_p(buf + s->cookie_offset);
} else {
cookie = ldl_be_p(buf + s->cookie_offset);
cookie = ldl_be_p(buf + s->cookie_offset) & 0xffffffffULL;
}
if (cookie != s->rx_cookie) {
if (!s->header_mismatch) {