linux-kernel - [syzbot] memory leak in iovec_from

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Date:   Sat, 16 Apr 2022 18:27:21 -0700
From:   syzbot <syzbot+96b43810dfe9c3bb95ed@...kaller.appspotmail.com>
To:     asml.silence@...il.com, axboe@...nel.dk, io-uring@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] memory leak in iovec_from_user

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: syzbot+96b43810dfe9c3bb95ed@...kaller.appspotmail.com

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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