[PATCH] dma-buf: return -EINVAL if dmabuf object is NULL

[Nuno Sá]

On top of warning about a NULL object, we also want to return with a
proper error code (as done in 'dma_buf_begin_cpu_access()'). Otherwise,
we will get a NULL pointer dereference.

Fixes: fc13020e086b ("dma-buf: add support for kernel cpu access")
Signed-off-by: Nuno Sá <nuno...@analog.com>
---
 drivers/dma-buf/dma-buf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 63d32261b63f..8ec7876dd523 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1231,7 +1231,8 @@ int dma_buf_end_cpu_access(struct dma_buf *dmabuf,
 {
        int ret = 0;
 
-       WARN_ON(!dmabuf);
+       if (WARN_ON(!dmabuf))
+               return -EINVAL;
 
        might_lock(&dmabuf->resv->lock.base);
 
-- 
2.32.0