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| author | Wei Yongjun <yjwei@cn.fujitsu.com> | 2008-12-25 16:58:11 -0800 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2009-06-07 21:36:31 +0200 |
| commit | f75929935b4b5d460d13eb4e70ba8b93dd81140f (patch) | |
| tree | 821e11fa4b3100ac63e653c45c19fef7525b2abc | |
| parent | 38ae37b46c4b4cc3de8ff083fdaea9ff303ef2f8 (diff) | |
| download | linux-2.4-f75929935b4b5d460d13eb4e70ba8b93dd81140f.tar.gz | |
sctp: Avoid memory overflow while FWD-TSN chunk is received with bad stream ID
(backported from 2.6 commit 9fcb95a105758b81ef0131cd18e2db5149f13e95)
If FWD-TSN chunk is received with bad stream ID, the sctp will not do the
validity check, this may cause memory overflow when overwrite the TSN of
the stream ID.
The FORWARD-TSN chunk is like this:
FORWARD-TSN chunk
Type = 192
Flags = 0
Length = 172
NewTSN = 99
Stream = 10000
StreamSequence = 0xFFFF
This patch fix this problem by discard the chunk if stream ID is not
less than MIS.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | net/sctp/sm_statefuns.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c index 992043f1a6ec53..e83aa6e0d966c0 100644 --- a/net/sctp/sm_statefuns.c +++ b/net/sctp/sm_statefuns.c @@ -3368,6 +3368,7 @@ sctp_disposition_t sctp_sf_eat_fwd_tsn(const struct sctp_endpoint *ep, { struct sctp_chunk *chunk = arg; struct sctp_fwdtsn_hdr *fwdtsn_hdr; + struct sctp_fwdtsn_skip *skip; __u16 len; __u32 tsn; @@ -3397,6 +3398,12 @@ sctp_disposition_t sctp_sf_eat_fwd_tsn(const struct sctp_endpoint *ep, if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) goto discard_noforce; + /* Silently discard the chunk if stream-id is not valid */ + sctp_walk_fwdtsn(skip, chunk) { + if (ntohs(skip->stream) >= asoc->c.sinit_max_instreams) + goto discard_noforce; + } + sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); if (len > sizeof(struct sctp_fwdtsn_hdr)) sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, @@ -3431,6 +3438,7 @@ sctp_disposition_t sctp_sf_eat_fwd_tsn_fast( { struct sctp_chunk *chunk = arg; struct sctp_fwdtsn_hdr *fwdtsn_hdr; + struct sctp_fwdtsn_skip *skip; __u16 len; __u32 tsn; @@ -3460,6 +3468,12 @@ sctp_disposition_t sctp_sf_eat_fwd_tsn_fast( if (sctp_tsnmap_check(&asoc->peer.tsn_map, tsn) < 0) goto gen_shutdown; + /* Silently discard the chunk if stream-id is not valid */ + sctp_walk_fwdtsn(skip, chunk) { + if (ntohs(skip->stream) >= asoc->c.sinit_max_instreams) + goto gen_shutdown; + } + sctp_add_cmd_sf(commands, SCTP_CMD_REPORT_FWDTSN, SCTP_U32(tsn)); if (len > sizeof(struct sctp_fwdtsn_hdr)) sctp_add_cmd_sf(commands, SCTP_CMD_PROCESS_FWDTSN, |