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| author |   Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> | 2019-06-27 19:48:10 -0300 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-07-01 19:01:47 -0700 |
| commit | 4d1415811e492d9a8238f8a92dd0d51612c788e9 (patch) | |
| tree | cc7d9f8ecb68fa97fbbc68d0796355261ea86869 /net/sctp | |
| parent | netrom: fix a memory leak in nr_rx_frame() (diff) | |
| download | linux-dev-4d1415811e492d9a8238f8a92dd0d51612c788e9.tar.xz linux-dev-4d1415811e492d9a8238f8a92dd0d51612c788e9.zip | |
sctp: fix error handling on stream scheduler initialization
It allocates the extended area for outbound streams only on sendmsg
calls, if they are not yet allocated. When using the priority
stream scheduler, this initialization may imply into a subsequent
allocation, which may fail. In this case, it was aborting the stream
scheduler initialization but leaving the ->ext pointer (allocated) in
there, thus in a partially initialized state. On a subsequent call to
sendmsg, it would notice the ->ext pointer in there, and trip on
uninitialized stuff when trying to schedule the data chunk.
The fix is undo the ->ext initialization if the stream scheduler
initialization fails and avoid the partially initialized state.
Although syzkaller bisected this to commit 4ff40b86262b ("sctp: set
chunk transport correctly when it's a new asoc"), this bug was actually
introduced on the commit I marked below.
Reported-by: syzbot+c1a380d42b190ad1e559@syzkaller.appspotmail.com
Fixes: 5bbbbe32a431 ("sctp: introduce stream scheduler foundations")
Tested-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
| -rw-r--r-- | net/sctp/stream.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/net/sctp/stream.c b/net/sctp/stream.c index 93ed07877337..25946604af85 100644 --- a/net/sctp/stream.c +++ b/net/sctp/stream.c @@ -153,13 +153,20 @@ out: int sctp_stream_init_ext(struct sctp_stream *stream, __u16 sid) { struct sctp_stream_out_ext *soute; + int ret; soute = kzalloc(sizeof(*soute), GFP_KERNEL); if (!soute) return -ENOMEM; SCTP_SO(stream, sid)->ext = soute; - return sctp_sched_init_sid(stream, sid, GFP_KERNEL); + ret = sctp_sched_init_sid(stream, sid, GFP_KERNEL); + if (ret) { + kfree(SCTP_SO(stream, sid)->ext); + SCTP_SO(stream, sid)->ext = NULL; + } + + return ret; } void sctp_stream_free(struct sctp_stream *stream) |