From: Kees Cook Date: Tue, 3 Oct 2023 23:18:33 +0000 (-0700) Subject: flow_offload: Annotate struct flow_action_entry with __counted_by X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=99474727d5d5b56f6d417ae6010d93407bbaaebb;p=linux.git flow_offload: Annotate struct flow_action_entry 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 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" Cc: Eric Dumazet Cc: Jakub Kicinski Cc: Paolo Abeni Cc: netdev@vger.kernel.org Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1] Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Signed-off-by: David S. Miller --- diff --git a/include/net/flow_offload.h b/include/net/flow_offload.h index 9efa9a59e81f6..314087a5e1818 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)