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drm: Restore the NULL check for drm_gem_object_put()

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Some users want to pass NULL to drm_gem_object_put(), but those using
__drm_gem_object_put() did not. Compromise, have both and let the
compiler sort it out.

drm_gem_fb_destroy() calls drm_gem_object_put() with NULL obj causing:
[   11.584209] BUG: kernel NULL pointer dereference, address: 0000000000000000
[   11.584213] #PF: supervisor write access in kernel mode
[   11.584215] #PF: error_code(0x0002) - not-present page
[   11.584216] PGD 0 P4D 0
[   11.584220] Oops: 0002 [#1] SMP NOPTI
[   11.584223] CPU: 7 PID: 1571 Comm: gnome-shell Tainted: G            E     5.7.0-rc1-1-default+ #27
[   11.584225] Hardware name: Micro-Star International Co., Ltd. MS-7A31/X370 XPOWER GAMING TITANIUM (MS-7A31), BIOS 1.MR 12/03/2019
[   11.584237] RIP: 0010:drm_gem_fb_destroy+0x28/0x70 [drm_kms_helper]
<snip>
[   11.584256] Call Trace:
[   11.584279]  drm_mode_rmfb+0x189/0x1c0 [drm]
[   11.584299]  ? drm_mode_rmfb+0x1c0/0x1c0 [drm]
[   11.584314]  drm_ioctl_kernel+0xaa/0xf0 [drm]
[   11.584329]  drm_ioctl+0x1ff/0x3b0 [drm]
[   11.584347]  ? drm_mode_rmfb+0x1c0/0x1c0 [drm]
[   11.584421]  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
[   11.584427]  ksys_ioctl+0x87/0xc0
[   11.584430]  __x64_sys_ioctl+0x16/0x20
[   11.584434]  do_syscall_64+0x5f/0x240
[   11.584438]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   11.584440] RIP: 0033:0x7f0ef80f7227

Reported-by: Nirmoy Das <nirmoy.das@amd.com>
Fixes: b5d250744c ("drm/gem: fold drm_gem_object_put_unlocked and __drm_gem_object_put()")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Nirmoy Das <nirmoy.das@amd.com>
Cc: Emil Velikov <emil.velikov@collabora.com>
Cc: Christian König <christian.koenig@amd.com>.
Acked-by: Nirmoy Das <nirmoy.das@amd.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200520142347.29060-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-05-20 15:23:47 +01:00
parent ef8255506f
commit 0e799e840a
2 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/i915/gem/i915_gem_object.h
View File

@ -105,7 +105,7 @@ __attribute__((nonnull))
static inline void
i915_gem_object_put(struct drm_i915_gem_object *obj)
{
drm_gem_object_put(&obj->base);
__drm_gem_object_put(&obj->base);
}
#define assert_object_held(obj) dma_resv_assert_held((obj)->base.resv)

10
include/drm/drm_gem.h
View File

@ -363,6 +363,13 @@ static inline void drm_gem_object_get(struct drm_gem_object *obj)
kref_get(&obj->refcount);
}
__attribute__((nonnull))
static inline void
__drm_gem_object_put(struct drm_gem_object *obj)
{
kref_put(&obj->refcount, drm_gem_object_free);
}
/**
* drm_gem_object_put - drop a GEM buffer object reference
* @obj: GEM buffer object
@ -372,7 +379,8 @@ static inline void drm_gem_object_get(struct drm_gem_object *obj)
static inline void
drm_gem_object_put(struct drm_gem_object *obj)
{
kref_put(&obj->refcount, drm_gem_object_free);
if (obj)
__drm_gem_object_put(obj);
}
void drm_gem_object_put_locked(struct drm_gem_object *obj);