Commit 2e3219b5 authored by Wei Yongjun's avatar Wei Yongjun Committed by David S. Miller
Browse files

sctp: fix append error cause to ERROR chunk correctly 



commit 5fa782c2
  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: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
Reviewed-by: default avatarNeil Horman <nhorman@tuxdriver.com>
Acked-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent f8bd9091

net/sctp/sm_make_chunk.c

+2 −2
Original line number Diff line number Diff line
@@ -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;

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