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drm/i915: Check for allocation failure

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The memory allocation for C is not being null checked and hence we
could end up with a null pointer dereference. Fix this with a null
pointer check. (I really should have noticed this when I was fixing an
earlier issue.)

Detected by CoverityScan, CID#1436406 ("Dereference null return")

Fixes: 47624cc330 ("drm/i915: Import the kfence selftests for i915_sw_fence")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170519175617.7036-1-colin.king@canonical.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Colin Ian King 2017-05-19 18:56:17 +01:00 committed by Chris Wilson
parent 00bd16f257
commit 0109808145
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/selftests/i915_sw_fence.c
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@ -123,6 +123,11 @@ static int test_dag(void *arg)
}
C = alloc_fence();
if (!C) {
ret = -ENOMEM;
goto err_B;
}
if (i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL) == -EINVAL) {
pr_err("invalid cycle detected\n");
goto err_C;