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autofs4: fix string validation check order 

In function validate_dev_ioctl() we check that the string we've been sent
is a valid path.  The function that does this check assumes the string is
NULL terminated but our NULL termination check isn't done until after this
call.  This patch changes the order of the check.

Signed-off-by: Ian Kent <raven@themaw.net>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ian Kent 2009-01-06 14:42:09 -08:00 committed by Linus Torvalds
parent a92daf6ba1
commit bae8ec6655
1 changed files with 7 additions and 6 deletions
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13
fs/autofs4/dev-ioctl.c
View File

@ -124,7 +124,7 @@ static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)
/*
* Check sanity of parameter control fields and if a path is present
* check that it has a "/" and is terminated.
* check that it is terminated and contains at least one "/".
*/
static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param)
{
@ -138,15 +138,16 @@ static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param)
}
if (param->size > sizeof(*param)) {
err = check_name(param->path);
err = invalid_str(param->path,
(void *) ((size_t) param + param->size));
if (err) {
AUTOFS_WARN("invalid path supplied for cmd(0x%08x)",
cmd);
AUTOFS_WARN(
"path string terminator missing for cmd(0x%08x)",
cmd);
goto out;
}
err = invalid_str(param->path,
(void *) ((size_t) param + param->size));
err = check_name(param->path);
if (err) {
AUTOFS_WARN("invalid path supplied for cmd(0x%08x)",
cmd);