gpu: ion: Fix memory leak of dirty bits

Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 6ba2c39..3aeb41c 100644 (file)
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -164,24 +164,20 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
                return ERR_PTR(PTR_ERR(table));
        }
        buffer->sg_table = table;
-       if (buffer->flags & ION_FLAG_CACHED)
+       if (buffer->flags & ION_FLAG_CACHED) {
                for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->nents,
                            i) {
                        if (sg_dma_len(sg) == PAGE_SIZE)
                                continue;
                        pr_err("%s: cached mappings must have pagewise "
                               "sg_lists\n", __func__);
-                       heap->ops->unmap_dma(heap, buffer);
-                       kfree(buffer);
-                       return ERR_PTR(-EINVAL);
+                       ret = -EINVAL;
+                       goto err;
                }
 
-       ret = ion_buffer_alloc_dirty(buffer);
-       if (ret) {
-               heap->ops->unmap_dma(heap, buffer);
-               heap->ops->free(buffer);
-               kfree(buffer);
-               return ERR_PTR(ret);
+               ret = ion_buffer_alloc_dirty(buffer);
+               if (ret)
+                       goto err;
        }
 
        buffer->dev = dev;
@@ -200,6 +196,12 @@ static struct ion_buffer *ion_buffer_create(struct ion_heap *heap,
                sg_dma_address(sg) = sg_phys(sg);
        ion_buffer_add(dev, buffer);
        return buffer;
+
+err:
+       heap->ops->unmap_dma(heap, buffer);
+       heap->ops->free(buffer);
+       kfree(buffer);
+       return ERR_PTR(ret);
 }
 
 static void ion_buffer_destroy(struct kref *kref)
@@ -209,12 +211,13 @@ static void ion_buffer_destroy(struct kref *kref)
 
        if (WARN_ON(buffer->kmap_cnt > 0))
                buffer->heap->ops->unmap_kernel(buffer->heap, buffer);
-
        buffer->heap->ops->unmap_dma(buffer->heap, buffer);
        buffer->heap->ops->free(buffer);
        mutex_lock(&dev->lock);
        rb_erase(&buffer->node, &dev->buffers);
        mutex_unlock(&dev->lock);
+       if (buffer->flags & ION_FLAG_CACHED)
+               kfree(buffer->dirty);
        kfree(buffer);
 }