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authorWei Yongjun <yjwei@cn.fujitsu.com>2010-05-17 22:51:58 -0700
committerDavid S. Miller <davem@davemloft.net>2010-05-17 22:51:58 -0700
commit2e3219b5c8a2e44e0b83ae6e04f52f20a82ac0f2 (patch)
tree526cd94d906cc687f556631643fdfa43260918c5
parentf8bd909183acffad68780b10c1cdf36161cfd5d1 (diff)
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>
-rw-r--r--net/sctp/sm_make_chunk.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index d8261f3d771..bd2a50b482a 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;