memory leak in drm_vma_node

memory leak in drm_vma_node_allow
Status: upstream: reported syz repro on 2020/04/11 07:59
Reported-by: syzbot+04639d98c75c52e41b8a@syzkaller.appspotmail.com
First crash: 127d, last: 127d

Sample crash report:

2020/04/07 05:10:47 executed programs: 23
2020/04/07 05:10:53 executed programs: 35
2020/04/07 05:11:00 executed programs: 46
2020/04/07 05:11:06 executed programs: 62
BUG: memory leak
unreferenced object 0xffff888104682080 (size 64):
  comm "syz-executor.5", pid 8616, jiffies 4294946318 (age 15.290s)
  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 da bd 03 81 88 ff ff  ................
  backtrace:
    [<00000000cac525e9>] kmalloc include/linux/slab.h:555 [inline]
    [<00000000cac525e9>] drm_vma_node_allow+0x32/0x120 drivers/gpu/drm/drm_vma_manager.c:274
    [<00000000ab055b7c>] drm_gem_handle_create_tail+0xd8/0x250 drivers/gpu/drm/drm_gem.c:403
    [<00000000d1e67364>] vgem_gem_create drivers/gpu/drm/vgem/vgem_drv.c:198 [inline]
    [<00000000d1e67364>] vgem_gem_dumb_create+0x73/0x100 drivers/gpu/drm/vgem/vgem_drv.c:218
    [<00000000dd87232b>] drm_mode_create_dumb+0xbe/0xf0 drivers/gpu/drm/drm_dumb_buffers.c:94
    [<00000000d7ff7e08>] drm_ioctl_kernel+0xcb/0x130 drivers/gpu/drm/drm_ioctl.c:787
    [<0000000080a20f26>] drm_ioctl+0x25c/0x420 drivers/gpu/drm/drm_ioctl.c:887
    [<00000000d53a93ee>] vfs_ioctl fs/ioctl.c:47 [inline]
    [<00000000d53a93ee>] ksys_ioctl+0xa6/0xd0 fs/ioctl.c:763
    [<00000000c5492a67>] __do_sys_ioctl fs/ioctl.c:772 [inline]
    [<00000000c5492a67>] __se_sys_ioctl fs/ioctl.c:770 [inline]
    [<00000000c5492a67>] __x64_sys_ioctl+0x1a/0x20 fs/ioctl.c:770
    [<00000000becf688f>] do_syscall_64+0x6e/0x220 arch/x86/entry/common.c:295
    [<0000000050094727>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Crashes (1):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-gce-leak	2020/04/07 07:48	upstream	7e634208	99a96044	.config	log	report	syz		airlied@linux.ie, daniel@ffwll.ch, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de