Am 20.03.24 um 00:15 schrieb Pavel Sakharov:
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: d62c43a953ce ("dma-buf: Enable signaling on fence for selftests") Signed-off-by: Pavel Sakharov p.sakharov@ispras.ru
Reviewed-by: Christian König christian.koenig@amd.com
Going to push it to drm-misc-fixes in a minute.
Thanks, Christian.
drivers/dma-buf/st-dma-fence-chain.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/dma-buf/st-dma-fence-chain.c b/drivers/dma-buf/st-dma-fence-chain.c index 9c2a0c082a76..ed4b323886e4 100644 --- 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);
-- 2.44.0
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