netdev - [PATCH] sctp: fix append error cause to ERROR chunk correctly

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Message-ID: <4BEC9B50.60502@cn.fujitsu.com>
Date:	Fri, 14 May 2010 08:37:36 +0800
From:	Wei Yongjun <yjwei@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	Vlad Yasevich <vladislav.yasevich@...com>,
	Neil Horman <nhorman@...driver.com>,
	linux-sctp@...r.kernel.org, Eugene Teo <eteo@...hat.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: [PATCH] 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@...fujitsu.com>
Reviewed-by: Neil Horman <nhorman@...driver.com>
Acked-by: Vlad Yasevich <vladislav.yasevich@...com>
---
 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 30c1767..70d6c10 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),
@@ -1421,7 +1421,7 @@ 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;
-- 
1.6.5.2

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