Add err goto label and use it when VMA can't be established or changes
underneath.
v2:
- Dropping Fixes: as it's indeed impossible to race an object to the
error address. (Chris)
v3:
- Use IS_ERR_VALUE (Chris)
Reported-by: Adam Zabrocki <adamza@xxxxxxxxxxxxx>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxxxxxxx>
Cc: Adam Zabrocki <adamza@xxxxxxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> #v2
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 52639f749908..6728ea5c71d4 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1740,6 +1740,9 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
addr = vm_mmap(obj->base.filp, 0, args->size,
PROT_READ | PROT_WRITE, MAP_SHARED,
args->offset);
+ if (IS_ERR_VALUE(addr))
+ goto err;
+
if (args->flags & I915_MMAP_WC) {
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
@@ -1755,17 +1758,22 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
else
addr = -ENOMEM;
up_write(&mm->mmap_sem);
+ if (IS_ERR_VALUE(addr))
+ goto err;
/* This may race, but that's ok, it only gets set */
WRITE_ONCE(obj->frontbuffer_ggtt_origin, ORIGIN_CPU);
}
i915_gem_object_put(obj);
- if (IS_ERR((void *)addr))
- return addr;
args->addr_ptr = (u64)addr;
return 0;
+
+err:
+ i915_gem_object_put(obj);
+
+ return addr;
}
static unsigned int tile_row_pages(const struct drm_i915_gem_object *obj)
--
2.20.1
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