T.J. Mercier ea5ff5d351 dma-buf: heaps: Fix off-by-one in CMA heap fault handler ... Until VM_DONTEXPAND was added in commit 1c1914d6e8 ("dma-buf: heaps: Don't track CMA dma-buf pages under RssFile") it was possible to obtain a mapping larger than the buffer size via mremap and bypass the overflow check in dma_buf_mmap_internal. When using such a mapping to attempt to fault past the end of the buffer, the CMA heap fault handler also checks the fault offset against the buffer size, but gets the boundary wrong by 1. Fix the boundary check so that we don't read off the end of the pages array and insert an arbitrary page in the mapping. Reported-by: Xingyu Jin <xingyuj@google.com> Fixes: a5d2d29e24 ("dma-buf: heaps: Move heap-helper logic into the cma_heap implementation") Cc: stable@vger.kernel.org # Applicable >= 5.10. Needs adjustments only for 5.10. Signed-off-by: T.J. Mercier <tjmercier@google.com> Acked-by: John Stultz <jstultz@google.com> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240830192627.2546033-1-tjmercier@google.com		2024-09-09 15:37:20 +05:30
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cma_heap.c	dma-buf: heaps: Fix off-by-one in CMA heap fault handler	2024-09-09 15:37:20 +05:30
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system_heap.c