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sctp: fix memory leak in sctp_stream_outq_migrate() 

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

Link: https://syzkaller.appspot.com/bug?exrid=29c402e56c4760763cc0
Fixes: 637784ade2 ("sctp: introduce priority based stream scheduler")
Reported-by: syzbot+29c402e56c4760763cc0@syzkaller.appspotmail.com
Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>
Reviewed-by: Xin Long <lucien.xin@gmail.com>
Link: https://lore.kernel.org/r/20221126031720.378562-1-shaozhengchao@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Zhengchao Shao 2022-11-26 11:17:20 +08:00 committed by Jakub Kicinski
parent b85f628aa1
commit 9ed7bfc795
5 changed files with 49 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/sctp/stream_sched.h
View File

@ -26,6 +26,8 @@ struct sctp_sched_ops {
int (*init)(struct sctp_stream *stream);
/* Init a stream */
int (*init_sid)(struct sctp_stream *stream, __u16 sid, gfp_t gfp);
/* free a stream */
void (*free_sid)(struct sctp_stream *stream, __u16 sid);
/* Frees the entire thing */
void (*free)(struct sctp_stream *stream);

25
net/sctp/stream.c
View File

@ -52,6 +52,19 @@ static void sctp_stream_shrink_out(struct sctp_stream *stream, __u16 outcnt)
}
}
static void sctp_stream_free_ext(struct sctp_stream *stream, __u16 sid)
{
struct sctp_sched_ops *sched;
if (!SCTP_SO(stream, sid)->ext)
return;
sched = sctp_sched_ops_from_stream(stream);
sched->free_sid(stream, sid);
kfree(SCTP_SO(stream, sid)->ext);
SCTP_SO(stream, sid)->ext = NULL;
}
/* Migrates chunks from stream queues to new stream queues if needed,
* but not across associations. Also, removes those chunks to streams
* higher than the new max.
@ -70,16 +83,14 @@ static void sctp_stream_outq_migrate(struct sctp_stream *stream,
* sctp_stream_update will swap ->out pointers.
*/
for (i = 0; i < outcnt; i++) {
kfree(SCTP_SO(new, i)->ext);
sctp_stream_free_ext(new, i);
SCTP_SO(new, i)->ext = SCTP_SO(stream, i)->ext;
SCTP_SO(stream, i)->ext = NULL;
}
}
for (i = outcnt; i < stream->outcnt; i++) {
kfree(SCTP_SO(stream, i)->ext);
SCTP_SO(stream, i)->ext = NULL;
}
for (i = outcnt; i < stream->outcnt; i++)
sctp_stream_free_ext(stream, i);
}
static int sctp_stream_alloc_out(struct sctp_stream *stream, __u16 outcnt,
@ -174,9 +185,9 @@ void sctp_stream_free(struct sctp_stream *stream)
struct sctp_sched_ops *sched = sctp_sched_ops_from_stream(stream);
int i;
sched->free(stream);
sched->unsched_all(stream);
for (i = 0; i < stream->outcnt; i++)
kfree(SCTP_SO(stream, i)->ext);
sctp_stream_free_ext(stream, i);
genradix_free(&stream->out);
genradix_free(&stream->in);
}

5
net/sctp/stream_sched.c
View File

@ -46,6 +46,10 @@ static int sctp_sched_fcfs_init_sid(struct sctp_stream *stream, __u16 sid,
return 0;
}
static void sctp_sched_fcfs_free_sid(struct sctp_stream *stream, __u16 sid)
{
}
static void sctp_sched_fcfs_free(struct sctp_stream *stream)
{
}
@ -96,6 +100,7 @@ static struct sctp_sched_ops sctp_sched_fcfs = {
.get = sctp_sched_fcfs_get,
.init = sctp_sched_fcfs_init,
.init_sid = sctp_sched_fcfs_init_sid,
.free_sid = sctp_sched_fcfs_free_sid,
.free = sctp_sched_fcfs_free,
.enqueue = sctp_sched_fcfs_enqueue,
.dequeue = sctp_sched_fcfs_dequeue,

19
net/sctp/stream_sched_prio.c
View File

@ -204,6 +204,24 @@ static int sctp_sched_prio_init_sid(struct sctp_stream *stream, __u16 sid,
return sctp_sched_prio_set(stream, sid, 0, gfp);
}
static void sctp_sched_prio_free_sid(struct sctp_stream *stream, __u16 sid)
{
struct sctp_stream_priorities *prio = SCTP_SO(stream, sid)->ext->prio_head;
int i;
if (!prio)
return;
SCTP_SO(stream, sid)->ext->prio_head = NULL;
for (i = 0; i < stream->outcnt; i++) {
if (SCTP_SO(stream, i)->ext &&
SCTP_SO(stream, i)->ext->prio_head == prio)
return;
}
kfree(prio);
}
static void sctp_sched_prio_free(struct sctp_stream *stream)
{
struct sctp_stream_priorities *prio, *n;
@ -323,6 +341,7 @@ static struct sctp_sched_ops sctp_sched_prio = {
.get = sctp_sched_prio_get,
.init = sctp_sched_prio_init,
.init_sid = sctp_sched_prio_init_sid,
.free_sid = sctp_sched_prio_free_sid,
.free = sctp_sched_prio_free,
.enqueue = sctp_sched_prio_enqueue,
.dequeue = sctp_sched_prio_dequeue,

5
net/sctp/stream_sched_rr.c
View File

@ -90,6 +90,10 @@ static int sctp_sched_rr_init_sid(struct sctp_stream *stream, __u16 sid,
return 0;
}
static void sctp_sched_rr_free_sid(struct sctp_stream *stream, __u16 sid)
{
}
static void sctp_sched_rr_free(struct sctp_stream *stream)
{
sctp_sched_rr_unsched_all(stream);
@ -177,6 +181,7 @@ static struct sctp_sched_ops sctp_sched_rr = {
.get = sctp_sched_rr_get,
.init = sctp_sched_rr_init,
.init_sid = sctp_sched_rr_init_sid,
.free_sid = sctp_sched_rr_free_sid,
.free = sctp_sched_rr_free,
.enqueue = sctp_sched_rr_enqueue,
.dequeue = sctp_sched_rr_dequeue,