Commit ce402f04 authored by Xin Long's avatar Xin Long Committed by David S. Miller

sctp: fix the issue that the cookie-ack with auth can't get processed

When auth is enabled for cookie-ack chunk, in sctp_inq_pop, sctp
processes auth chunk first, then continues to the next chunk in
this packet if chunk_end + chunk_hdr size < skb_tail_pointer().
Otherwise, it will go to the next packet or discard this chunk.

However, it missed the fact that cookie-ack chunk's size is equal
to chunk_hdr size, which couldn't match that check, and thus this
chunk would not get processed.

This patch fixes it by changing the check to chunk_end + chunk_hdr
size <= skb_tail_pointer().

Fixes: 26b87c78 ("net: sctp: fix remote memory pressure from excessive queueing")
Signed-off-by: default avatarXin Long <>
Acked-by: default avatarNeil Horman <>
Acked-by: default avatarMarcelo Ricardo Leitner <>
Signed-off-by: default avatarDavid S. Miller <>
parent 46e16d4b
......@@ -217,7 +217,7 @@ struct sctp_chunk *sctp_inq_pop(struct sctp_inq *queue)
skb_pull(chunk->skb, sizeof(*ch));
chunk->subh.v = NULL; /* Subheader is no longer valid. */
if (chunk->chunk_end + sizeof(*ch) < skb_tail_pointer(chunk->skb)) {
if (chunk->chunk_end + sizeof(*ch) <= skb_tail_pointer(chunk->skb)) {
/* This is not a singleton */
chunk->singleton = 0;
} else if (chunk->chunk_end > skb_tail_pointer(chunk->skb)) {
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