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 fib_info. [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci Cc: "David S. Miller" <[email protected]> Cc: David Ahern <[email protected]> Cc: Eric Dumazet <[email protected]> Cc: Jakub Kicinski <[email protected]> Cc: Paolo Abeni <[email protected]> Cc: [email protected] Signed-off-by: Kees Cook <[email protected]> --- include/net/ip_fib.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h index f0c13864180e..84b0a82c9df4 100644 --- a/include/net/ip_fib.h +++ b/include/net/ip_fib.h @@ -156,7 +156,7 @@ struct fib_info { bool nh_updated; struct nexthop *nh; struct rcu_head rcu; - struct fib_nh fib_nh[]; + struct fib_nh fib_nh[] __counted_by(fib_nhs); }; -- 2.34.1
