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| author |   Tina Zhang <tina.zhang@intel.com> | 2020-02-25 13:35:27 +0800 |
|---|---|---|
| committer |   Zhenyu Wang <zhenyuw@linux.intel.com> | 2020-02-25 16:14:20 +0800 |
| commit | b549c252b1292aea959cd9b83537fcb9384a6112 (patch) | |
| tree | a2b6c2ff0a12f7667dfc7c10536a7abfcc7d7d71 /drivers/gpu/drm | |
| parent | drm/i915/gvt: Separate display reset from ALL_ENGINES reset (diff) | |
| download | linux-dev-b549c252b1292aea959cd9b83537fcb9384a6112.tar.xz linux-dev-b549c252b1292aea959cd9b83537fcb9384a6112.zip | |
drm/i915/gvt: Fix orphan vgpu dmabuf_objs' lifetime
Deleting dmabuf item's list head after releasing its container can lead
to KASAN-reported issue:
BUG: KASAN: use-after-free in __list_del_entry_valid+0x15/0xf0
Read of size 8 at addr ffff88818a4598a8 by task kworker/u8:3/13119
So fix this issue by puting deleting dmabuf_objs ahead of releasing its
container.
Fixes: dfb6ae4e14bd6 ("drm/i915/gvt: Handle orphan dmabuf_objs")
Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20200225053527.8336-2-tina.zhang@intel.com
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/i915/gvt/dmabuf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.c b/drivers/gpu/drm/i915/gvt/dmabuf.c index 2477a1e5a166..ae139f0877ae 100644 --- a/drivers/gpu/drm/i915/gvt/dmabuf.c +++ b/drivers/gpu/drm/i915/gvt/dmabuf.c @@ -151,12 +151,12 @@ static void dmabuf_gem_object_free(struct kref *kref) dmabuf_obj = container_of(pos, struct intel_vgpu_dmabuf_obj, list); if (dmabuf_obj == obj) { + list_del(pos); intel_gvt_hypervisor_put_vfio_device(vgpu); idr_remove(&vgpu->object_idr, dmabuf_obj->dmabuf_id); kfree(dmabuf_obj->info); kfree(dmabuf_obj); - list_del(pos); break; } } |