syzbot


memory leak in iovec_from_user

Status: fixed on 2023/02/24 13:50
Subsystems: fs io-uring
[Documentation on labels]
Reported-by: syzbot+96b43810dfe9c3bb95ed@syzkaller.appspotmail.com
Fix commit: 323b190ba2de io_uring: free iovec if file assignment fails
First crash: 685d, last: 685d
Discussions (3)
Title Replies (including bot) Last reply
[PATCH 5.17 000/146] 5.17.5-rc1 review 156 (156) 2022/04/27 10:01
[PATCH] io_uring: free iovec if file assignment fails 1 (1) 2022/04/17 13:43
[syzbot] memory leak in iovec_from_user 2 (4) 2022/04/17 13:37
Last patch testing requests (1)
Created Duration User Patch Repo Result
2022/04/17 13:27 9m axboe@kernel.dk git://git.kernel.dk/linux-block io_uring-5.18 OK

Sample crash report:
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


Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/04/13 01:22 upstream ce522ba9ef7e dacb3f1c .config console log report syz C ci-upstream-gce-leak memory leak in iovec_from_user
* Struck through repros no longer work on HEAD.