All of lore.kernel.org
 help / color / mirror / Atom feed
From: syzbot <syzbot+9f864abad79fae7c17e1@syzkaller.appspotmail.com>
To: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org,
	linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com,
	tytso@mit.edu
Subject: memory leak in kobject_set_name_vargs (3)
Date: Mon, 21 Sep 2020 03:02:21 -0700	[thread overview]
Message-ID: <000000000000443d8a05afcff2b5@google.com> (raw)

Hello,

syzbot found the following issue on:

HEAD commit:    bdcf11de Merge tag 'riscv-for-linus-5.9-rc6' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=179e18d3900000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a1f3c5052e8097e9
dashboard link: https://syzkaller.appspot.com/bug?extid=9f864abad79fae7c17e1
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14c33cad900000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=154bc6c3900000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9f864abad79fae7c17e1@syzkaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88811a0d75c0 (size 32):
  comm "syz-executor307", pid 6444, jiffies 4294941412 (age 12.730s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 30 00 00 00 00 00 00 00 00 00 00 00  loop0...........
    01 00 00 00 03 00 00 00 2b 00 00 00 00 00 00 00  ........+.......
  backtrace:
    [<00000000f89b0bef>] kstrdup+0x36/0x70 mm/util.c:60
    [<000000004b68a0da>] kstrdup_const+0x35/0x60 mm/util.c:82
    [<000000008eb65a51>] kvasprintf_const+0x72/0xe0 lib/kasprintf.c:48
    [<00000000691729e7>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<00000000dfb16dfe>] kobject_add_varg lib/kobject.c:384 [inline]
    [<00000000dfb16dfe>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473
    [<000000005849f02f>] ext4_register_sysfs+0x6b/0x160 fs/ext4/sysfs.c:508
    [<0000000027523718>] ext4_fill_super+0x2d04/0x46c0 fs/ext4/super.c:4799
    [<0000000095f0e4f3>] mount_bdev+0x1d3/0x210 fs/super.c:1417
    [<00000000415e8d00>] legacy_get_tree+0x26/0x70 fs/fs_context.c:592
    [<00000000bf686d81>] vfs_get_tree+0x28/0xe0 fs/super.c:1547
    [<00000000fd6d6aba>] do_new_mount fs/namespace.c:2875 [inline]
    [<00000000fd6d6aba>] path_mount+0x90e/0xda0 fs/namespace.c:3192
    [<000000008d02c1d0>] do_mount fs/namespace.c:3205 [inline]
    [<000000008d02c1d0>] __do_sys_mount fs/namespace.c:3413 [inline]
    [<000000008d02c1d0>] __se_sys_mount fs/namespace.c:3390 [inline]
    [<000000008d02c1d0>] __x64_sys_mount+0x140/0x190 fs/namespace.c:3390
    [<000000001c682859>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<0000000095c447b2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88811a0d74e0 (size 32):
  comm "syz-executor307", pid 6451, jiffies 4294941943 (age 7.420s)
  hex dump (first 32 bytes):
    6c 6f 6f 70 30 00 00 00 00 00 00 00 00 00 00 00  loop0...........
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000f89b0bef>] kstrdup+0x36/0x70 mm/util.c:60
    [<000000004b68a0da>] kstrdup_const+0x35/0x60 mm/util.c:82
    [<000000008eb65a51>] kvasprintf_const+0x72/0xe0 lib/kasprintf.c:48
    [<00000000691729e7>] kobject_set_name_vargs+0x3b/0xe0 lib/kobject.c:289
    [<00000000dfb16dfe>] kobject_add_varg lib/kobject.c:384 [inline]
    [<00000000dfb16dfe>] kobject_init_and_add+0x6d/0xc0 lib/kobject.c:473
    [<000000005849f02f>] ext4_register_sysfs+0x6b/0x160 fs/ext4/sysfs.c:508
    [<0000000027523718>] ext4_fill_super+0x2d04/0x46c0 fs/ext4/super.c:4799
    [<0000000095f0e4f3>] mount_bdev+0x1d3/0x210 fs/super.c:1417
    [<00000000415e8d00>] legacy_get_tree+0x26/0x70 fs/fs_context.c:592
    [<00000000bf686d81>] vfs_get_tree+0x28/0xe0 fs/super.c:1547
    [<00000000fd6d6aba>] do_new_mount fs/namespace.c:2875 [inline]
    [<00000000fd6d6aba>] path_mount+0x90e/0xda0 fs/namespace.c:3192
    [<000000008d02c1d0>] do_mount fs/namespace.c:3205 [inline]
    [<000000008d02c1d0>] __do_sys_mount fs/namespace.c:3413 [inline]
    [<000000008d02c1d0>] __se_sys_mount fs/namespace.c:3390 [inline]
    [<000000008d02c1d0>] __x64_sys_mount+0x140/0x190 fs/namespace.c:3390
    [<000000001c682859>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<0000000095c447b2>] entry_SYSCALL_64_after_hwframe+0x44/0xa9



---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches

             reply	other threads:[~2020-09-21 10:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-21 10:02 syzbot [this message]
2020-09-22 16:24 ` [PATCH] ext4: fix leaking sysfs kobject after failed mount Eric Biggers
2020-09-24  9:08   ` Jan Kara
2020-10-03  4:56     ` Theodore Y. Ts'o

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=000000000000443d8a05afcff2b5@google.com \
    --to=syzbot+9f864abad79fae7c17e1@syzkaller.appspotmail.com \
    --cc=adilger.kernel@dilger.ca \
    --cc=linux-ext4@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=syzkaller-bugs@googlegroups.com \
    --cc=tytso@mit.edu \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.