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autofs4 copy_dev_ioctl(): keep the value of ->size we'd used for allocation

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X-Coverup: just ask spender
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-02-21 22:19:57 -05:00
parent 7e0e953bb0
commit 0a280962dc
1 changed files with 6 additions and 2 deletions
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8
fs/autofs4/dev-ioctl.c
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@ -95,7 +95,7 @@ static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param)
*/
static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *in)
{
struct autofs_dev_ioctl tmp;
struct autofs_dev_ioctl tmp, *res;
if (copy_from_user(&tmp, in, sizeof(tmp)))
return ERR_PTR(-EFAULT);
@ -106,7 +106,11 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i
if (tmp.size > (PATH_MAX + sizeof(tmp)))
return ERR_PTR(-ENAMETOOLONG);
return memdup_user(in, tmp.size);
res = memdup_user(in, tmp.size);
if (!IS_ERR(res))
res->size = tmp.size;
return res;
}
static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)