linux-hardening - [PATCH 2/2] net/ipv4: Annotate imsf_slist_flex with __counted_by(imsf

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Date: Fri,  9 Feb 2024 17:16:42 -0800
From: Kees Cook <keescook@...omium.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Kees Cook <keescook@...omium.org>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Paolo Abeni <pabeni@...hat.com>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	netdev@...r.kernel.org,
	linux-hardening@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Dan Williams <dan.j.williams@...el.com>,
	Keith Packard <keithp@...thp.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Dmitry Antipov <dmantipov@...dex.ru>,
	Nathan Chancellor <nathan@...nel.org>,
	kernel test robot <lkp@...el.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] net/ipv4: Annotate imsf_slist_flex with __counted_by(imsf_numsrc)

The size of the imsf_slist_flex member is determined by imsf_numsrc, so
annotate it as such.

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Eric Dumazet <edumazet@...gle.com>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: Paolo Abeni <pabeni@...hat.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: netdev@...r.kernel.org
Cc: linux-hardening@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 include/uapi/linux/in.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/in.h b/include/uapi/linux/in.h
index e682ab628dfa..445f6ae76f1e 100644
--- a/include/uapi/linux/in.h
+++ b/include/uapi/linux/in.h
@@ -199,7 +199,8 @@ struct ip_msfilter {
 	__u32		imsf_numsrc;
 	union {
 		__be32		imsf_slist[1];
-		__DECLARE_FLEX_ARRAY(__be32, imsf_slist_flex);
+		__DECLARE_FLEX_ARRAY_ATTR(__be32, imsf_slist_flex,
+					  __counted_by(imsf_numsrc));
 	};
 };
 
-- 
2.34.1