linux-kernel - [PATCH] f2fs: Use struct_size() helper to improve f2fs_acl

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Message-ID: <20240924102800.240209-2-thorsten.blum@linux.dev>
Date: Tue, 24 Sep 2024 12:28:01 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: Jaegeuk Kim <jaegeuk@...nel.org>,
	Chao Yu <chao@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-f2fs-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org
Subject: [PATCH] f2fs: Use struct_size() helper to improve f2fs_acl_clone()

Use struct_size() to calculate the number of bytes to allocate for a
cloned acl.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 fs/f2fs/acl.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/acl.c b/fs/f2fs/acl.c
index 8bffdeccdbc3..1fbc0607363b 100644
--- a/fs/f2fs/acl.c
+++ b/fs/f2fs/acl.c
@@ -296,9 +296,8 @@ static struct posix_acl *f2fs_acl_clone(const struct posix_acl *acl,
 	struct posix_acl *clone = NULL;
 
 	if (acl) {
-		int size = sizeof(struct posix_acl) + acl->a_count *
-				sizeof(struct posix_acl_entry);
-		clone = kmemdup(acl, size, flags);
+		clone = kmemdup(acl, struct_size(acl, a_entries, acl->a_count),
+				flags);
 		if (clone)
 			refcount_set(&clone->a_refcount, 1);
 	}
-- 
2.46.1