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 libipw_txb. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: Stanislav Yakovlev <stas.yakovlev@xxxxxxxxx> Cc: Kalle Valo <kvalo@xxxxxxxxxx> Cc: linux-wireless@xxxxxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> --- drivers/net/wireless/intel/ipw2x00/libipw.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/wireless/intel/ipw2x00/libipw.h b/drivers/net/wireless/intel/ipw2x00/libipw.h index bec7bc273748..9065ca5b0208 100644 --- a/drivers/net/wireless/intel/ipw2x00/libipw.h +++ b/drivers/net/wireless/intel/ipw2x00/libipw.h @@ -488,7 +488,7 @@ struct libipw_txb { u8 reserved; u16 frag_size; u16 payload_size; - struct sk_buff *fragments[]; + struct sk_buff *fragments[] __counted_by(nr_frags); }; /* SWEEP TABLE ENTRIES NUMBER */ -- 2.34.1
