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dma-buf: handle empty dma_fence_arrays gracefully 

A bug inside the new sync-file merge code created empty dma_fence_array instances.

Warn about that and handle those without crashing.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220329070001.134180-2-christian.koenig@amd.com
This commit is contained in:
Christian König 2022-03-25 16:38:54 +01:00
parent 21d139d73f
commit c42ee39c1e
1 changed files with 5 additions and 0 deletions
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5
drivers/dma-buf/dma-fence-array.c
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@ -159,6 +159,8 @@ struct dma_fence_array *dma_fence_array_create(int num_fences,
struct dma_fence_array *array;
size_t size = sizeof(*array);
WARN_ON(!num_fences || !fences);
/* Allocate the callback structures behind the array. */
size += num_fences * sizeof(struct dma_fence_array_cb);
array = kzalloc(size, GFP_KERNEL);
@ -231,6 +233,9 @@ struct dma_fence *dma_fence_array_first(struct dma_fence *head)
if (!array)
return head;
if (!array->num_fences)
return NULL;
return array->fences[0];
}
EXPORT_SYMBOL(dma_fence_array_first);