This is a note to let you know that I've just added the patch titled
sctp: fix a potential overflow in sctp_ifwdtsn_skip
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
sctp-fix-a-potential-overflow-in-sctp_ifwdtsn_skip.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 65cbe99f081d93526561cb8d0e25677fc9c2863e
Author: Xin Long <lucien.xin@xxxxxxxxx>
Date: Mon Apr 10 15:43:30 2023 -0400
sctp: fix a potential overflow in sctp_ifwdtsn_skip
[ Upstream commit 32832a2caf82663870126c5186cf8f86c8b2a649 ]
Currently, when traversing ifwdtsn skips with _sctp_walk_ifwdtsn, it only
checks the pos against the end of the chunk. However, the data left for
the last pos may be < sizeof(struct sctp_ifwdtsn_skip), and dereference
it as struct sctp_ifwdtsn_skip may cause coverflow.
This patch fixes it by checking the pos against "the end of the chunk -
sizeof(struct sctp_ifwdtsn_skip)" in sctp_ifwdtsn_skip, similar to
sctp_fwdtsn_skip.
Fixes: 0fc2ea922c8a ("sctp: implement validate_ftsn for sctp_stream_interleave")
Signed-off-by: Xin Long <lucien.xin@xxxxxxxxx>
Link: https://lore.kernel.org/r/2a71bffcd80b4f2c61fac6d344bb2f11c8fd74f7.1681155810.git.lucien.xin@xxxxxxxxx
Signed-off-by: Paolo Abeni <pabeni@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/sctp/stream_interleave.c b/net/sctp/stream_interleave.c
index 6b13f737ebf2e..e3aad75cb11d9 100644
--- a/net/sctp/stream_interleave.c
+++ b/net/sctp/stream_interleave.c
@@ -1162,7 +1162,8 @@ static void sctp_generate_iftsn(struct sctp_outq *q, __u32 ctsn)
#define _sctp_walk_ifwdtsn(pos, chunk, end) \
for (pos = chunk->subh.ifwdtsn_hdr->skip; \
- (void *)pos < (void *)chunk->subh.ifwdtsn_hdr->skip + (end); pos++)
+ (void *)pos <= (void *)chunk->subh.ifwdtsn_hdr->skip + (end) - \
+ sizeof(struct sctp_ifwdtsn_skip); pos++)
#define sctp_walk_ifwdtsn(pos, ch) \
_sctp_walk_ifwdtsn((pos), (ch), ntohs((ch)->chunk_hdr->length) - \
