From: Vlad Yasevich Date: Wed, 5 Sep 2007 19:53:58 +0000 (-0400) Subject: SCTP: Validate buffer room when processing sequential chunks X-Git-Tag: v2.6.23-rc9~41^2~6 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=a09c83847b664dcd67a72613374061c900afb799;p=linux-2.6-omap-h63xx.git SCTP: Validate buffer room when processing sequential chunks When we process bundled chunks, we need to make sure that the skb has the buffer for each header since we assume it's always there. Some malicious node can send us something like DATA + 2 bytes and we'll try to walk off the end refrencing potentially uninitialized memory. Signed-off-by: Vlad Yasevich --- diff --git a/net/sctp/inqueue.c b/net/sctp/inqueue.c index 88aa2240754..e4ea7fdf36e 100644 --- a/net/sctp/inqueue.c +++ b/net/sctp/inqueue.c @@ -130,6 +130,14 @@ struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue) /* Force chunk->skb->data to chunk->chunk_end. */ skb_pull(chunk->skb, chunk->chunk_end - chunk->skb->data); + + /* Verify that we have at least chunk headers + * worth of buffer left. + */ + if (skb_headlen(chunk->skb) < sizeof(sctp_chunkhdr_t)) { + sctp_chunk_free(chunk); + chunk = queue->in_progress = NULL; + } } }