linux-kernel - [PATCH] lib: memscan() fixlet

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Message-ID: <YLv4cCf0t5UPdyK+@localhost.localdomain>
Date:   Sun, 6 Jun 2021 01:19:28 +0300
From:   Alexey Dobriyan <adobriyan@...il.com>
To:     akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] lib: memscan() fixlet

Generic version doesn't trucate second argument to char.

Older brother memchr() does as do s390, sparc and i386 assembly
versions.

Fortunately, no code passes c >= 256.

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 lib/string.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/string.c
+++ b/lib/string.c
@@ -977,7 +977,7 @@ void *memscan(void *addr, int c, size_t size)
 	unsigned char *p = addr;
 
 	while (size) {
-		if (*p == c)
+		if (*p == (unsigned char)c)
 			return (void *)p;
 		p++;
 		size--;