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| author | Sasha Levin <sasha.levin@oracle.com> | 2014-04-09 01:04:11 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-09 01:48:51 +0200 |
| commit | e53d77eb8bb616e903e34cc7a918401bee3b5149 (patch) | |
| tree | bdab4a168e8afc00590dcec684205c656ae2e81e | |
| parent | mm: vmscan: do not swap anon pages just because free+file is low (diff) | |
| download | linux-e53d77eb8bb616e903e34cc7a918401bee3b5149.tar.xz linux-e53d77eb8bb616e903e34cc7a918401bee3b5149.zip | |
autofs4: check dev ioctl size before allocating
There wasn't any check of the size passed from userspace before trying
to allocate the memory required.
This meant that userspace might request more space than allowed,
triggering an OOM.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Signed-off-by: Ian Kent <raven@themaw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/autofs4/dev-ioctl.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c index 3182c0e68b42..232e03d4780d 100644 --- a/fs/autofs4/dev-ioctl.c +++ b/fs/autofs4/dev-ioctl.c @@ -103,6 +103,9 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i if (tmp.size < sizeof(tmp)) return ERR_PTR(-EINVAL); + if (tmp.size > (PATH_MAX + sizeof(tmp))) + return ERR_PTR(-ENAMETOOLONG); + return memdup_user(in, tmp.size); } |