[PATCH] string: use strnlen in strlcat

[Thorsten Blum]

Use strnlen() to limit the destination scan to the provided buffer size.
Remove the redundant comment.

Signed-off-by: Thorsten Blum <thorsten.b...@linux.dev>
---
 lib/string.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/lib/string.c b/lib/string.c
index b632c71df1a5..7b67e186d898 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -251,12 +251,11 @@ EXPORT_SYMBOL(strncat);
 #ifndef __HAVE_ARCH_STRLCAT
 size_t strlcat(char *dest, const char *src, size_t count)
 {
-       size_t dsize = strlen(dest);
+       size_t dsize = strnlen(dest, count);
        size_t len = strlen(src);
        size_t res = dsize + len;
 
-       /* This would be a bug */
-       BUG_ON(dsize >= count);
+       BUG_ON(dsize == count);
 
        dest += dsize;
        count -= dsize;