check_sync() calls bucket_find_contain(), which in turn calls
dma_get_max_seg_size(), which dereferences the device pointer.
Signed-off-by: Maarten ter Huurne <maarten@xxxxxxxxxxxxxx>
---
lib/dma-debug.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 8971370..84c6e88 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1223,6 +1223,11 @@ static void check_sync(struct device *dev,
struct hash_bucket *bucket;
unsigned long flags;
+ if (!ref->dev) {
+ err_printk(dev, NULL, "DMA-API: device driver passes NULL for device to DMA sync function; cannot check usage\n");
+ return;
+ }
+
bucket = get_hash_bucket(ref, &flags);
entry = bucket_find_contain(&bucket, ref, &flags);
--
2.6.6
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