When sctp_stream_outq_migrate() is called to release stream out resources,
the memory pointed to by prio_head in stream out is not released.
The memory leak information is as follows:
unreferenced object 0xffff88801fe79f80 (size 64):
comm "sctp_repo", pid 7957, jiffies 4294951704 (age 36.480s)
hex dump (first 32 bytes):
80 9f e7 1f 80 88 ff ff 80 9f e7 1f 80 88 ff ff ................
90 9f e7 1f 80 88 ff ff 90 9f e7 1f 80 88 ff ff ................
backtrace:
[<ffffffff81b215c6>] kmalloc_trace+0x26/0x60
[<ffffffff88ae517c>] sctp_sched_prio_set+0x4cc/0x770
[<ffffffff88ad64f2>] sctp_stream_init_ext+0xd2/0x1b0
[<ffffffff88aa2604>] sctp_sendmsg_to_asoc+0x1614/0x1a30
[<ffffffff88ab7ff1>] sctp_sendmsg+0xda1/0x1ef0
[<ffffffff87f765ed>] inet_sendmsg+0x9d/0xe0
[<ffffffff8754b5b3>] sock_sendmsg+0xd3/0x120
[<ffffffff8755446a>] __sys_sendto+0x23a/0x340
[<ffffffff87554651>] __x64_sys_sendto+0xe1/0x1b0
[<ffffffff89978b49>] do_syscall_64+0x39/0xb0
[<ffffffff89a0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
Fixes: 637784ade221 ("sctp: introduce priority based stream scheduler")
Reported-by: syzbot+29c402e56c4760763cc0@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Zhengchao Shao <shaozhengchao@xxxxxxxxxx>
---
net/sctp/stream.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/net/sctp/stream.c b/net/sctp/stream.c
index ef9fceadef8d..a17dc368876f 100644
--- a/net/sctp/stream.c
+++ b/net/sctp/stream.c
@@ -70,6 +70,9 @@ static void sctp_stream_outq_migrate(struct sctp_stream *stream,
* sctp_stream_update will swap ->out pointers.
*/
for (i = 0; i < outcnt; i++) {
+ if (SCTP_SO(new, i)->ext)
+ kfree(SCTP_SO(new, i)->ext->prio_head);
+
kfree(SCTP_SO(new, i)->ext);
SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
SCTP_SO(stream, i)->ext = NULL;
@@ -77,6 +80,9 @@ static void sctp_stream_outq_migrate(struct sctp_stream *stream,
}
for (i = outcnt; i < stream->outcnt; i++) {
+ if (SCTP_SO(stream, i)->ext)
+ kfree(SCTP_SO(stream, i)->ext->prio_head);
+
kfree(SCTP_SO(stream, i)->ext);
SCTP_SO(stream, i)->ext = NULL;
}
--
2.17.1
