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 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 flow_action_entry. Cc: "David S. Miller" <da...@davemloft.net> Cc: Eric Dumazet <eduma...@google.com> Cc: Jakub Kicinski <k...@kernel.org> Cc: Paolo Abeni <pab...@redhat.com> Cc: net...@vger.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook <keesc...@chromium.org> --- include/net/flow_offload.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h index 9efa9a59e81f..314087a5e181 100644 --- a/include/net/flow_offload.h +++ b/include/net/flow_offload.h @@ -333,7 +333,7 @@ struct flow_action_entry { struct flow_action { unsigned int num_entries; - struct flow_action_entry entries[]; + struct flow_action_entry entries[] __counted_by(num_entries); }; static inline bool flow_action_has_entries(const struct flow_action *action) -- 2.34.1
