dma-buf: Fix NULL pointer dereference in sanitycheck()

[ Upstream commit 2295bd8 ] If due to a memory allocation failure mock_chain() returns NULL, it is passed to dma_fence_enable_sw_signaling() resulting in NULL pointer dereference there. Call dma_fence_enable_sw_signaling() only if mock_chain() succeeds. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: d62c43a ("dma-buf: Enable signaling on fence for selftests") Signed-off-by: Pavel Sakharov <[email protected]> Reviewed-by: Christian König <[email protected]> Signed-off-by: Christian König <[email protected]> Link: https://patchwork.freedesktop.org/patch/msgid/[email protected] Signed-off-by: Sasha Levin <[email protected]>
raspberrypi · Apr 10, 2024 · 156c226 · 156c226
1 parent aeecb67
commit 156c226
Showing 1 changed file with 3 additions and 3 deletions.
diff --git a/drivers/dma-buf/st-dma-fence-chain.c b/drivers/dma-buf/st-dma-fence-chain.c
@@ -84,11 +84,11 @@ static int sanitycheck(void *arg)
 		return -ENOMEM;
 
 	chain = mock_chain(NULL, f, 1);
-	if (!chain)
+	if (chain)
+		dma_fence_enable_sw_signaling(chain);
+	else
 		err = -ENOMEM;
 
-	dma_fence_enable_sw_signaling(chain);
-
 	dma_fence_signal(f);
 	dma_fence_put(f);