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| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-02-22 06:19:57 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-02-22 19:43:34 +0300 |
| commit | 0a280962dc6e117e0e4baa668453f753579265d9 (patch) | |
| tree | f71b4f953705ddb4d3820866c4976b54cd4aab11 | |
| parent | 7e0e953bb0cf649f93277ac8fb67ecbb7f7b04a9 (diff) | |
| download | linux-0a280962dc6e117e0e4baa668453f753579265d9.tar.xz | |
autofs4 copy_dev_ioctl(): keep the value of ->size we'd used for allocation
X-Coverup: just ask spender
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
| -rw-r--r-- | fs/autofs4/dev-ioctl.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c index aaf96cb25452..ac7d921ed984 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) |