dmaengine: ep93xx_dma: Annotate struct ep93xx_dma_engine with __counted_by
Prepare for the coming implementation by GCC and Clang of the __counted_by attribute. Flexible array members annotated with __counted_by can have their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family functions). As found with Coccinelle[1], add __counted_by for struct ep93xx_dma_engine. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Vinod Koul <vkoul@kernel.org> Cc: Nathan Chancellor <nathan@kernel.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: Tom Rix <trix@redhat.com> Cc: dmaengine@vger.kernel.org Cc: llvm@lists.linux.dev Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org> Link: https://lore.kernel.org/r/20230928234334.work.391-kees@kernel.org Signed-off-by: Vinod Koul <vkoul@kernel.org>
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@ -213,7 +213,7 @@ struct ep93xx_dma_engine {
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#define INTERRUPT_NEXT_BUFFER 2
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size_t num_channels;
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struct ep93xx_dma_chan channels[];
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struct ep93xx_dma_chan channels[] __counted_by(num_channels);
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};
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static inline struct device *chan2dev(struct ep93xx_dma_chan *edmac)
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