From: Kees Cook Date: Fri, 22 Sep 2023 17:50:15 +0000 (-0700) Subject: i3c: master: cdns: Annotate struct cdns_i3c_xfer with __counted_by X-Git-Tag: v6.7-rc1~58^2~25 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=49f33846efc079eb94b044bf897e90909fd3aa11;p=thirdparty%2Fkernel%2Flinux.git i3c: master: cdns: Annotate struct cdns_i3c_xfer 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 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 cdns_i3c_xfer. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: "Przemysław Gaj" Cc: Alexandre Belloni Cc: linux-i3c@lists.infradead.org Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Link: https://lore.kernel.org/r/20230922175014.work.637-kees@kernel.org Signed-off-by: Alexandre Belloni --- diff --git a/drivers/i3c/master/i3c-master-cdns.c b/drivers/i3c/master/i3c-master-cdns.c index 8f1fda3c7ac52..bcbe8f914149b 100644 --- a/drivers/i3c/master/i3c-master-cdns.c +++ b/drivers/i3c/master/i3c-master-cdns.c @@ -387,7 +387,7 @@ struct cdns_i3c_xfer { struct completion comp; int ret; unsigned int ncmds; - struct cdns_i3c_cmd cmds[]; + struct cdns_i3c_cmd cmds[] __counted_by(ncmds); }; struct cdns_i3c_data {