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authorAl Viro <viro@zeniv.linux.org.uk>2015-02-21 22:19:57 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-18 13:22:32 +0100
commitd91c5de58cd9ed6d37f14bde906bb307bf681ba1 (patch)
tree9f47576f13a3aa3c9cfebf18030ae3d58933b7ef /fs
parent9fd948c1b776066a84386d146f3a4e848b976bd5 (diff)
downloadlinux-linaro-stable-d91c5de58cd9ed6d37f14bde906bb307bf681ba1.tar.gz
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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 743c7c2c949d..6aa8312ad89f 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)