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authorAl Viro <viro@zeniv.linux.org.uk>2015-02-21 22:19:57 -0500
committerBen Hutchings <ben@decadent.org.uk>2015-05-09 23:16:20 +0100
commit17f606d841fbc7e0331af2f0cab2af801f18ed46 (patch)
treeb69b21e1027402e2c2539e7e1c6fc2911411d7e2 /fs
parentcc9247b6d794b82e7e8bc0cb7a936181015c8e90 (diff)
autofs4 copy_dev_ioctl(): keep the value of ->size we'd used for allocation
commit 0a280962dc6e117e0e4baa668453f753579265d9 upstream. X-Coverup: just ask spender Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/autofs4/dev-ioctl.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 868101ccbefa..62d7a6d9a701 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);
@@ -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)