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| author | Wei Yongjun <yjwei@cn.fujitsu.com> | 2010-05-17 22:51:58 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-05-17 22:51:58 -0700 |
| commit | 2e3219b5c8a2e44e0b83ae6e04f52f20a82ac0f2 (patch) | |
| tree | 526cd94d906cc687f556631643fdfa43260918c5 /net | |
| parent | f8bd909183acffad68780b10c1cdf36161cfd5d1 (diff) | |
| download | lwn-2e3219b5c8a2e44e0b83ae6e04f52f20a82ac0f2.tar.gz lwn-2e3219b5c8a2e44e0b83ae6e04f52f20a82ac0f2.zip | |
sctp: fix append error cause to ERROR chunk correctly
commit 5fa782c2f5ef6c2e4f04d3e228412c9b4a4c8809
sctp: Fix skb_over_panic resulting from multiple invalid \
parameter errors (CVE-2010-1173) (v4)
cause 'error cause' never be add the the ERROR chunk due to
some typo when check valid length in sctp_init_cause_fixed().
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: Neil Horman <nhorman@tuxdriver.com>
Acked-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sctp/sm_make_chunk.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index d8261f3d7715..bd2a50b482ac 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -141,7 +141,7 @@ int sctp_init_cause_fixed(struct sctp_chunk *chunk, __be16 cause_code, len = sizeof(sctp_errhdr_t) + paylen; err.length = htons(len); - if (skb_tailroom(chunk->skb) > len) + if (skb_tailroom(chunk->skb) < len) return -ENOSPC; chunk->subh.err_hdr = sctp_addto_chunk_fixed(chunk, sizeof(sctp_errhdr_t), @@ -1415,7 +1415,7 @@ void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data) void *sctp_addto_chunk_fixed(struct sctp_chunk *chunk, int len, const void *data) { - if (skb_tailroom(chunk->skb) > len) + if (skb_tailroom(chunk->skb) >= len) return sctp_addto_chunk(chunk, len, data); else return NULL; |