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 mxser_board. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Jiri Slaby <[email protected]> Cc: Greg Kroah-Hartman <[email protected]> Cc: Shawn Guo <[email protected]> Cc: Sascha Hauer <[email protected]> Cc: Pengutronix Kernel Team <[email protected]> Cc: Fabio Estevam <[email protected]> Cc: NXP Linux Team <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: Kees Cook <[email protected]> --- drivers/tty/mxser.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c index 10aa4ed38793..6ce7f259968f 100644 --- a/drivers/tty/mxser.c +++ b/drivers/tty/mxser.c @@ -288,7 +288,7 @@ struct mxser_board { enum mxser_must_hwid must_hwid; speed_t max_baud; - struct mxser_port ports[]; + struct mxser_port ports[] __counted_by(nports); }; static DECLARE_BITMAP(mxser_boards, MXSER_BOARDS); -- 2.34.1
