From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 0a280962dc6e117e0e4baa668453f753579265d9 upstream.
X-Coverup: just ask spender
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
fs/autofs4/dev-ioctl.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 0f00da329e71..792234f15b9f 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -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);
@@ -103,7 +103,11 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i
if (tmp.size < sizeof(tmp))
return ERR_PTR(-EINVAL);
- 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)
--
2.3.0
--
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