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autofs4: use memchr() in invalid_string()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2009-04-07 11:12:46 -04:00
parent 66672fefaa
commit 3eac8778a2
1 changed files with 4 additions and 6 deletions
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8
fs/autofs4/dev-ioctl.c
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@ -54,10 +54,9 @@ static int check_name(const char *name)
* Check a string doesn't overrun the chunk of * Check a string doesn't overrun the chunk of
* memory we copied from user land. * 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 (memchr(str, 0, size))
if (!*str++)
return 0; return 0;
return -EINVAL; return -EINVAL;
} }
@ -138,8 +137,7 @@ static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param)
} }
if (param->size > sizeof(*param)) { if (param->size > sizeof(*param)) {
err = invalid_str(param->path, err = invalid_str(param->path, param->size - sizeof(*param));
(void *) ((size_t) param + param->size));
if (err) { if (err) {
AUTOFS_WARN( AUTOFS_WARN(
"path string terminator missing for cmd(0x%08x)", "path string terminator missing for cmd(0x%08x)",