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authorMike Christie <mchristi@redhat.com>2018-07-16 02:16:17 +0300
committerChristoph Hellwig <hch@lst.de>2018-07-17 16:14:07 +0300
commitcc57c07343bd071cdf1915a91a24ab7d40c9b590 (patch)
treee8432f3ff2cf715a1808701abbfe7e3291a86d88
parent1823342a1f2b47a4e6f5667f67cd28ab6bc4d6cd (diff)
downloadlinux-cc57c07343bd071cdf1915a91a24ab7d40c9b590.tar.xz
configfs: fix registered group removal
This patch fixes a bug where configfs_register_group had added a group in a tree, and userspace has done a rmdir on a dir somewhere above that group and we hit a kernel crash. The problem is configfs_rmdir will detach everything under it and unlink groups on the default_groups list. It will not unlink groups added with configfs_register_group so when configfs_unregister_group is called to drop its references to the group/items we crash when we try to access the freed dentrys. The patch just adds a check for if a rmdir has been done above us and if so just does the unlink part of unregistration. Sorry if you are getting this multiple times. I thouhgt I sent this to some of you and lkml, but I do not see it. Signed-off-by: Mike Christie <mchristi@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--fs/configfs/dir.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 577cff24707b..39843fa7e11b 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1777,6 +1777,16 @@ void configfs_unregister_group(struct config_group *group)
struct dentry *dentry = group->cg_item.ci_dentry;
struct dentry *parent = group->cg_item.ci_parent->ci_dentry;
+ mutex_lock(&subsys->su_mutex);
+ if (!group->cg_item.ci_parent->ci_group) {
+ /*
+ * The parent has already been unlinked and detached
+ * due to a rmdir.
+ */
+ goto unlink_group;
+ }
+ mutex_unlock(&subsys->su_mutex);
+
inode_lock_nested(d_inode(parent), I_MUTEX_PARENT);
spin_lock(&configfs_dirent_lock);
configfs_detach_prep(dentry, NULL);
@@ -1791,6 +1801,7 @@ void configfs_unregister_group(struct config_group *group)
dput(dentry);
mutex_lock(&subsys->su_mutex);
+unlink_group:
unlink_group(group);
mutex_unlock(&subsys->su_mutex);
}