linux-kernel - [23/23] sctp: fix append error cause to ERROR chunk correctly

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Message-Id: <20100701172858.380695161@clark.site>
Date:	Thu, 01 Jul 2010 10:27:12 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Wei Yongjun <yjwei@...fujitsu.com>,
	Vlad Yasevich <vladislav.yasevich@...com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [23/23] sctp: fix append error cause to ERROR chunk correctly

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Wei Yongjun <yjwei@...fujitsu.com>

commit 2e3219b5c8a2e44e0b83ae6e04f52f20a82ac0f2 upstream.

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/sctp/sm_make_chunk.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -140,7 +140,7 @@ int sctp_init_cause_fixed(struct sctp_ch
 	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),
@@ -1401,7 +1401,7 @@ void *sctp_addto_chunk(struct sctp_chunk
 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;


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