[PATCH][next] drm/i915/selftests: fix null pointer dereference on pointer data

[PATCH][next] drm/i915/selftests: fix null pointer dereference on pointer data

[Colin King]

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

In the case where data fails to be allocated the error exit path is
via label 'out' where data is dereferenced in a for-loop.  Fix this
by exiting via the label 'out_file' instead to avoid the null pointer
dereference.

Addresses-Coverity: ("Dereference after null check")
Fixes: 50d16d44cce4 ("drm/i915/selftests: Exercise context switching in parallel")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index fb58c0919ea1..e5c235051ae5 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -263,7 +263,7 @@ static int live_parallel_switch(void *arg)
 	if (!data) {
 		i915_gem_context_unlock_engines(ctx);
 		err = -ENOMEM;
-		goto out;
+		goto out_file;
 	}
 
 	m = 0; /* Use the first context as our template for the engines */
-- 
2.20.1

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Re: [PATCH][next] drm/i915/selftests: fix null pointer dereference on pointer data

[Chris Wilson]

Quoting Colin King (2019-10-09 11:00:24)
> From: Colin Ian King <colin.king@canonical.com>
> 
> In the case where data fails to be allocated the error exit path is
> via label 'out' where data is dereferenced in a for-loop.  Fix this
> by exiting via the label 'out_file' instead to avoid the null pointer
> dereference.
> 
> Addresses-Coverity: ("Dereference after null check")
> Fixes: 50d16d44cce4 ("drm/i915/selftests: Exercise context switching in parallel")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris