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fix sysfs_init_fs_context() in !CONFIG_NET_NS case

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Permission checks on current's netns should be done only when
netns are enabled.

Reported-by: Dominik Brodowski <linux@dominikbrodowski.net>
Fixes: 23bf1b6be9
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2019-03-16 09:45:42 -04:00
parent c99c2171fc
commit ab81dabda1
1 changed files with 5 additions and 3 deletions
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8
fs/sysfs/mount.c
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@ -71,9 +71,11 @@ static int sysfs_init_fs_context(struct fs_context *fc)
kfc->magic = SYSFS_MAGIC;
fc->fs_private = kfc;
fc->ops = &sysfs_fs_context_ops;
if (fc->user_ns)
put_user_ns(fc->user_ns);
fc->user_ns = get_user_ns(netns->user_ns);
if (netns) {
if (fc->user_ns)
put_user_ns(fc->user_ns);
fc->user_ns = get_user_ns(netns->user_ns);
}
fc->global = true;
return 0;
}