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authorXin Long <lucien.xin@gmail.com>2018-05-10 17:34:13 +0800
committerDavid S. Miller <davem@davemloft.net>2018-05-10 17:48:36 -0400
commit6910e25de2257e2c82c7a2d126e3463cd8e50810 (patch)
tree4f62bb31883657aee3d03961e715a5938df04519 /net/sctp
parenta577d868b768a3baf16cdd4841ab8cfb165521d6 (diff)
downloadlinux-6910e25de2257e2c82c7a2d126e3463cd8e50810.tar.bz2
sctp: remove sctp_chunk_put from fail_mark err path in sctp_ulpevent_make_rcvmsg
In Commit 1f45f78f8e51 ("sctp: allow GSO frags to access the chunk too"), it held the chunk in sctp_ulpevent_make_rcvmsg to access it safely later in recvmsg. However, it also added sctp_chunk_put in fail_mark err path, which is only triggered before holding the chunk. syzbot reported a use-after-free crash happened on this err path, where it shouldn't call sctp_chunk_put. This patch simply removes this call. Fixes: 1f45f78f8e51 ("sctp: allow GSO frags to access the chunk too") Reported-by: syzbot+141d898c5f24489db4aa@syzkaller.appspotmail.com Signed-off-by: Xin Long <lucien.xin@gmail.com> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
-rw-r--r--net/sctp/ulpevent.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index 84207ad33e8e..8cb7d9858270 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -715,7 +715,6 @@ struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
return event;
fail_mark:
- sctp_chunk_put(chunk);
kfree_skb(skb);
fail:
return NULL;