From 3eac8778a237d83a1e553eba0c6f4fd4b39eeec0 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 7 Apr 2009 11:12:46 -0400 Subject: [PATCH] autofs4: use memchr() in invalid_string() Signed-off-by: Al Viro --- fs/autofs4/dev-ioctl.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c index 463f798f71b3..84168c0dcc2d 100644 --- a/fs/autofs4/dev-ioctl.c +++ b/fs/autofs4/dev-ioctl.c @@ -54,11 +54,10 @@ static int check_name(const char *name) * Check a string doesn't overrun the chunk of * memory we copied from user land. */ -static int invalid_str(char *str, void *end) +static int invalid_str(char *str, size_t size) { - while ((void *) str <= end) - if (!*str++) - return 0; + if (memchr(str, 0, size)) + return 0; return -EINVAL; } @@ -138,8 +137,7 @@ static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param) } if (param->size > sizeof(*param)) { - err = invalid_str(param->path, - (void *) ((size_t) param + param->size)); + err = invalid_str(param->path, param->size - sizeof(*param)); if (err) { AUTOFS_WARN( "path string terminator missing for cmd(0x%08x)",