[PATCH][next] drm/i915/gtt: set err to -ENOMEM on memory allocation failure

[PATCH][next] drm/i915/gtt: set err to -ENOMEM on memory allocation failure

[Colin King]

From: Colin Ian King <colin.king@canonical.com>

Currently when the allocation of ppgtt->work fails the error return
path via err_free returns an uninitialized value in err. Fix this
by setting err to the appropriate error return of -ENOMEM.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: d3622099c76f ("drm/i915/gtt: Always acquire struct_mutex for gen6_ppgtt_cleanup")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 8d8a4b0ad4d9..8a9b506387d4 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2035,8 +2035,10 @@ static struct i915_hw_ppgtt *gen6_ppgtt_create(struct drm_i915_private *i915)
 	ppgtt->base.vm.pte_encode = ggtt->vm.pte_encode;
 
 	ppgtt->work = kmalloc(sizeof(*ppgtt->work), GFP_KERNEL);
-	if (!ppgtt->work)
+	if (!ppgtt->work) {
+		err = -ENOMEM;
 		goto err_free;
+	}
 
 	err = gen6_ppgtt_init_scratch(ppgtt);
 	if (err)
-- 
2.20.1

Re: [PATCH][next] drm/i915/gtt: set err to -ENOMEM on memory allocation failure

[Chris Wilson]

Quoting Colin King (2019-05-24 22:26:27)
> From: Colin Ian King <colin.king@canonical.com>
> 
> Currently when the allocation of ppgtt->work fails the error return
> path via err_free returns an uninitialized value in err. Fix this
> by setting err to the appropriate error return of -ENOMEM.
> 
> Addresses-Coverity: ("Uninitialized scalar variable")
> Fixes: d3622099c76f ("drm/i915/gtt: Always acquire struct_mutex for gen6_ppgtt_cleanup")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

Saw that last night but got distracted by the panic-on-boot...
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris