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 dw_i3c_xfer. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Alexandre Belloni <[email protected]> Cc: Jeremy Kerr <[email protected]> Cc: Joel Stanley <[email protected]> Cc: [email protected] Signed-off-by: Kees Cook <[email protected]> --- drivers/i3c/master/dw-i3c-master.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c index 9332ae5f6419..ef5751e91cc9 100644 --- a/drivers/i3c/master/dw-i3c-master.c +++ b/drivers/i3c/master/dw-i3c-master.c @@ -233,7 +233,7 @@ struct dw_i3c_xfer { struct completion comp; int ret; unsigned int ncmds; - struct dw_i3c_cmd cmds[]; + struct dw_i3c_cmd cmds[] __counted_by(ncmds); }; struct dw_i3c_i2c_dev_data { -- 2.34.1
