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authorVlad Yasevich <vladislav.yasevich@hp.com>2007-09-05 15:53:58 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-09-25 22:55:45 -0700
commita09c83847b664dcd67a72613374061c900afb799 (patch)
tree2d861171a944bb415d3cb0af82544836df1ced3d
parentca9938fea576ebbb8d8c4fbe8a5bcc937e49e1ca (diff)
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 <vladislav.yasevich@hp.com>
-rw-r--r--net/sctp/inqueue.c8
1 files changed, 8 insertions, 0 deletions
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;
+ }
}
}