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[PATCH] dma-buf: fix UAF in dma_buf_put() tracepoint

by Andi Shyti

dma_buf_put() may drop the final file reference via fput(), which can free the dma-buf. The new tracepoint invocation was added after fput(), and DMA_BUF_TRACE() dereferences dmabuf and takes dmabuf->name_lock. This leads to a use-after-free on the final put, visible for example as a spinlock bad magic fault on a poisoned 0x6b6b6b... lock. Move the dma_buf_put tracepoint before fput(). Reported-by: Janusz Krzysztofik <janusz.krzysztofik(a)linux.intel.com> Fixes: 281a22631423 ("dma-buf: add some tracepoints to debug.") Signed-off-by: Andi Shyti <andi.shyti(a)linux.intel.com> Cc: Xiang Gao <gaoxiang17(a)xiaomi.com> Cc: Christian König <christian.koenig(a)amd.com> --- Hi, I believe this patch fixes the issue reported by Janusz, I haven't tested it. Perhaps we can add some more checks in DMA_BUF_TRACE. Thanks, Andi drivers/dma-buf/dma-buf.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index a202a308c079..b72932c57cb9 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -845,9 +845,8 @@ void dma_buf_put(struct dma_buf *dmabuf) if (WARN_ON(!dmabuf || !dmabuf->file)) return; - fput(dmabuf->file); - DMA_BUF_TRACE(trace_dma_buf_put, dmabuf); + fput(dmabuf->file); } EXPORT_SYMBOL_NS_GPL(dma_buf_put, "DMA_BUF"); -- 2.53.0

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