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tcp: no md5sig option size check bug
author
Dmitry Popov
<dp@highloadlab.com>
Sun, 8 Aug 2010 03:24:28 +0000
(20:24 -0700)
committer
David S. Miller
<davem@davemloft.net>
Sun, 8 Aug 2010 03:24:28 +0000
(20:24 -0700)
tcp_parse_md5sig_option doesn't check md5sig option (TCPOPT_MD5SIG)
length, but tcp_v[46]_inbound_md5_hash assume that it's at least 16
bytes long.
Signed-off-by: Dmitry Popov <dp@highloadlab.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_input.c
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diff --git
a/net/ipv4/tcp_input.c
b/net/ipv4/tcp_input.c
index
3c426cb
..
e663b78
100644
(file)
--- a/
net/ipv4/tcp_input.c
+++ b/
net/ipv4/tcp_input.c
@@
-3930,7
+3930,7
@@
u8 *tcp_parse_md5sig_option(struct tcphdr *th)
if (opsize < 2 || opsize > length)
return NULL;
if (opcode == TCPOPT_MD5SIG)
- return
ptr
;
+ return
opsize == TCPOLEN_MD5SIG ? ptr : NULL
;
}
ptr += opsize - 2;
length -= opsize;