* [syzbot] memory leak in iovec_from_user
@ 2022-04-17 1:27 syzbot
2022-04-17 2:17 ` Jens Axboe
2022-04-17 13:27 ` Jens Axboe
0 siblings, 2 replies; 4+ messages in thread
From: syzbot @ 2022-04-17 1:27 UTC (permalink / raw)
To: asml.silence, axboe, io-uring, linux-kernel, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: ce522ba9ef7e Linux 5.18-rc2
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14225724f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=b8f1a3425e05af27
dashboard link: https://syzkaller.appspot.com/bug?extid=96b43810dfe9c3bb95ed
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c45d88f00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17b428af700000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
executing program
BUG: memory leak
unreferenced object 0xffff88810d698300 (size 192):
comm "syz-executor156", pid 3595, jiffies 4294944234 (age 12.580s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff823357be>] kmalloc_array include/linux/slab.h:621 [inline]
[<ffffffff823357be>] iovec_from_user lib/iov_iter.c:1922 [inline]
[<ffffffff823357be>] iovec_from_user+0x13e/0x280 lib/iov_iter.c:1905
[<ffffffff82335945>] __import_iovec+0x45/0x250 lib/iov_iter.c:1948
[<ffffffff81668c8e>] __io_import_iovec+0xfe/0x800 fs/io_uring.c:3497
[<ffffffff8166d92f>] io_import_iovec fs/io_uring.c:3508 [inline]
[<ffffffff8166d92f>] io_read+0x59f/0x880 fs/io_uring.c:3803
[<ffffffff816727b4>] io_issue_sqe+0x364/0x3270 fs/io_uring.c:7122
[<ffffffff816761c3>] __io_queue_sqe fs/io_uring.c:7489 [inline]
[<ffffffff816761c3>] io_queue_sqe fs/io_uring.c:7531 [inline]
[<ffffffff816761c3>] io_submit_sqe fs/io_uring.c:7736 [inline]
[<ffffffff816761c3>] io_submit_sqes+0x553/0x3030 fs/io_uring.c:7842
[<ffffffff81679390>] __do_sys_io_uring_enter+0x6f0/0x1100 fs/io_uring.c:10780
[<ffffffff8451ca25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
[<ffffffff8451ca25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
[<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
BUG: memory leak
unreferenced object 0xffff88810d6983c0 (size 192):
comm "syz-executor156", pid 3603, jiffies 4294944759 (age 7.330s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<ffffffff823357be>] kmalloc_array include/linux/slab.h:621 [inline]
[<ffffffff823357be>] iovec_from_user lib/iov_iter.c:1922 [inline]
[<ffffffff823357be>] iovec_from_user+0x13e/0x280 lib/iov_iter.c:1905
[<ffffffff82335945>] __import_iovec+0x45/0x250 lib/iov_iter.c:1948
[<ffffffff81668c8e>] __io_import_iovec+0xfe/0x800 fs/io_uring.c:3497
[<ffffffff8166d92f>] io_import_iovec fs/io_uring.c:3508 [inline]
[<ffffffff8166d92f>] io_read+0x59f/0x880 fs/io_uring.c:3803
[<ffffffff816727b4>] io_issue_sqe+0x364/0x3270 fs/io_uring.c:7122
[<ffffffff816761c3>] __io_queue_sqe fs/io_uring.c:7489 [inline]
[<ffffffff816761c3>] io_queue_sqe fs/io_uring.c:7531 [inline]
[<ffffffff816761c3>] io_submit_sqe fs/io_uring.c:7736 [inline]
[<ffffffff816761c3>] io_submit_sqes+0x553/0x3030 fs/io_uring.c:7842
[<ffffffff81679390>] __do_sys_io_uring_enter+0x6f0/0x1100 fs/io_uring.c:10780
[<ffffffff8451ca25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
[<ffffffff8451ca25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
[<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
---
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^ permalink raw reply [flat|nested] 4+ messages in thread* Re: [syzbot] memory leak in iovec_from_user
2022-04-17 1:27 [syzbot] memory leak in iovec_from_user syzbot
@ 2022-04-17 2:17 ` Jens Axboe
2022-04-17 13:27 ` Jens Axboe
1 sibling, 0 replies; 4+ messages in thread
From: Jens Axboe @ 2022-04-17 2:17 UTC (permalink / raw)
To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs
On 4/16/22 7:27 PM, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: ce522ba9ef7e Linux 5.18-rc2
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14225724f00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b8f1a3425e05af27
> dashboard link: https://syzkaller.appspot.com/bug?extid=96b43810dfe9c3bb95ed
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c45d88f00000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17b428af700000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
>
> executing program
> BUG: memory leak
> unreferenced object 0xffff88810d698300 (size 192):
> comm "syz-executor156", pid 3595, jiffies 4294944234 (age 12.580s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff823357be>] kmalloc_array include/linux/slab.h:621 [inline]
> [<ffffffff823357be>] iovec_from_user lib/iov_iter.c:1922 [inline]
> [<ffffffff823357be>] iovec_from_user+0x13e/0x280 lib/iov_iter.c:1905
> [<ffffffff82335945>] __import_iovec+0x45/0x250 lib/iov_iter.c:1948
> [<ffffffff81668c8e>] __io_import_iovec+0xfe/0x800 fs/io_uring.c:3497
> [<ffffffff8166d92f>] io_import_iovec fs/io_uring.c:3508 [inline]
> [<ffffffff8166d92f>] io_read+0x59f/0x880 fs/io_uring.c:3803
> [<ffffffff816727b4>] io_issue_sqe+0x364/0x3270 fs/io_uring.c:7122
> [<ffffffff816761c3>] __io_queue_sqe fs/io_uring.c:7489 [inline]
> [<ffffffff816761c3>] io_queue_sqe fs/io_uring.c:7531 [inline]
> [<ffffffff816761c3>] io_submit_sqe fs/io_uring.c:7736 [inline]
> [<ffffffff816761c3>] io_submit_sqes+0x553/0x3030 fs/io_uring.c:7842
> [<ffffffff81679390>] __do_sys_io_uring_enter+0x6f0/0x1100 fs/io_uring.c:10780
> [<ffffffff8451ca25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff8451ca25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
>
> BUG: memory leak
> unreferenced object 0xffff88810d6983c0 (size 192):
> comm "syz-executor156", pid 3603, jiffies 4294944759 (age 7.330s)
> hex dump (first 32 bytes):
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
> backtrace:
> [<ffffffff823357be>] kmalloc_array include/linux/slab.h:621 [inline]
> [<ffffffff823357be>] iovec_from_user lib/iov_iter.c:1922 [inline]
> [<ffffffff823357be>] iovec_from_user+0x13e/0x280 lib/iov_iter.c:1905
> [<ffffffff82335945>] __import_iovec+0x45/0x250 lib/iov_iter.c:1948
> [<ffffffff81668c8e>] __io_import_iovec+0xfe/0x800 fs/io_uring.c:3497
> [<ffffffff8166d92f>] io_import_iovec fs/io_uring.c:3508 [inline]
> [<ffffffff8166d92f>] io_read+0x59f/0x880 fs/io_uring.c:3803
> [<ffffffff816727b4>] io_issue_sqe+0x364/0x3270 fs/io_uring.c:7122
> [<ffffffff816761c3>] __io_queue_sqe fs/io_uring.c:7489 [inline]
> [<ffffffff816761c3>] io_queue_sqe fs/io_uring.c:7531 [inline]
> [<ffffffff816761c3>] io_submit_sqe fs/io_uring.c:7736 [inline]
> [<ffffffff816761c3>] io_submit_sqes+0x553/0x3030 fs/io_uring.c:7842
> [<ffffffff81679390>] __do_sys_io_uring_enter+0x6f0/0x1100 fs/io_uring.c:10780
> [<ffffffff8451ca25>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
> [<ffffffff8451ca25>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
> [<ffffffff84600068>] entry_SYSCALL_64_after_hwframe+0x44/0xae
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 659f8ecba5b7..d4feb5ca63ba 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3825,8 +3825,10 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
iovec = NULL;
}
ret = io_rw_init_file(req, FMODE_READ);
- if (unlikely(ret))
+ if (unlikely(ret)) {
+ kfree(iovec);
return ret;
+ }
req->result = iov_iter_count(&s->iter);
if (force_nonblock) {
@@ -3951,8 +3953,10 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
iovec = NULL;
}
ret = io_rw_init_file(req, FMODE_WRITE);
- if (unlikely(ret))
+ if (unlikely(ret)) {
+ kfree(iovec);
return ret;
+ }
req->result = iov_iter_count(&s->iter);
if (force_nonblock) {
--
Jens Axboe
^ permalink raw reply related [flat|nested] 4+ messages in thread* Re: [syzbot] memory leak in iovec_from_user
2022-04-17 1:27 [syzbot] memory leak in iovec_from_user syzbot
2022-04-17 2:17 ` Jens Axboe
@ 2022-04-17 13:27 ` Jens Axboe
2022-04-17 13:37 ` syzbot
1 sibling, 1 reply; 4+ messages in thread
From: Jens Axboe @ 2022-04-17 13:27 UTC (permalink / raw)
To: syzbot, asml.silence, io-uring, linux-kernel, syzkaller-bugs
#syz test: git://git.kernel.dk/linux-block io_uring-5.18
--
Jens Axboe
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-04-17 1:27 [syzbot] memory leak in iovec_from_user syzbot
2022-04-17 2:17 ` Jens Axboe
2022-04-17 13:27 ` Jens Axboe
2022-04-17 13:37 ` syzbot
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