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 checking 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 tid_rb_node. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Dennis Dalessandro <[email protected]> Cc: Jason Gunthorpe <[email protected]> Cc: Leon Romanovsky <[email protected]> Cc: [email protected] Signed-off-by: Kees Cook <[email protected]> --- drivers/infiniband/hw/hfi1/user_exp_rcv.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.h b/drivers/infiniband/hw/hfi1/user_exp_rcv.h index b85de9070aee..055726f7c139 100644 --- a/drivers/infiniband/hw/hfi1/user_exp_rcv.h +++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.h @@ -36,7 +36,7 @@ struct tid_rb_node { dma_addr_t dma_addr; bool freed; unsigned int npages; - struct page *pages[]; + struct page *pages[] __counted_by(npages); }; static inline int num_user_pages(unsigned long addr, -- 2.34.1
