linux-kernel - Re: [syzbot] memory leak in drm_vma_node

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Date:   Wed, 09 Nov 2022 10:25:47 -0800
From:   syzbot <syzbot+04639d98c75c52e41b8a@...kaller.appspotmail.com>
To:     11115066@...o.com, airlied@...il.com, airlied@...ux.ie,
        anant.thazhemadam@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org, igormtorrente@...il.com,
        linux-kernel@...r.kernel.org, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, syzkaller-bugs@...glegroups.com,
        tzimmermann@...e.de
Subject: Re: [syzbot] memory leak in drm_vma_node_allow

syzbot has found a reproducer for the following issue on:

HEAD commit:    f141df371335 Merge tag 'audit-pr-20221107' of git://git.ke..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=123bdcd1880000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f7ebe38e4b66a7b
dashboard link: https://syzkaller.appspot.com/bug?extid=04639d98c75c52e41b8a
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=158ec0c1880000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=120cc3e1880000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/d056ae4a8f32/disk-f141df37.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/02fdf71b87b4/vmlinux-f141df37.xz
kernel image: https://storage.googleapis.com/syzbot-assets/14078d70a64d/bzImage-f141df37.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+04639d98c75c52e41b8a@...kaller.appspotmail.com

executing program
executing program
executing program
executing program
BUG: memory leak
unreferenced object 0xffff88810f65f0c0 (size 64):
  comm "syz-executor402", pid 3630, jiffies 4294948375 (age 13.410s)
  hex dump (first 32 bytes):
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 00 94 b3 05 81 88 ff ff  ................
  backtrace:
    [<ffffffff814cfce0>] kmalloc_trace+0x20/0x90 mm/slab_common.c:1046
    [<ffffffff826b5bd2>] kmalloc include/linux/slab.h:576 [inline]
    [<ffffffff826b5bd2>] drm_vma_node_allow+0x32/0x120 drivers/gpu/drm/drm_vma_manager.c:274
    [<ffffffff8269bbda>] drm_gem_handle_create_tail+0x10a/0x250 drivers/gpu/drm/drm_gem.c:377
    [<ffffffff826e45e9>] drm_gem_shmem_create_with_handle drivers/gpu/drm/drm_gem_shmem_helper.c:432 [inline]
    [<ffffffff826e45e9>] drm_gem_shmem_dumb_create+0xb9/0x200 drivers/gpu/drm/drm_gem_shmem_helper.c:534
    [<ffffffff826cb557>] drm_mode_create_dumb+0x117/0x150 drivers/gpu/drm/drm_dumb_buffers.c:96
    [<ffffffff8269d094>] drm_ioctl_kernel+0x144/0x260 drivers/gpu/drm/drm_ioctl.c:788
    [<ffffffff8269d49c>] drm_ioctl+0x2ec/0x4f0 drivers/gpu/drm/drm_ioctl.c:891
    [<ffffffff81602aec>] vfs_ioctl fs/ioctl.c:51 [inline]
    [<ffffffff81602aec>] __do_sys_ioctl fs/ioctl.c:870 [inline]
    [<ffffffff81602aec>] __se_sys_ioctl fs/ioctl.c:856 [inline]
    [<ffffffff81602aec>] __x64_sys_ioctl+0xfc/0x140 fs/ioctl.c:856
    [<ffffffff84608245>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84608245>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd