diff options
| author | Jeff Mahoney <jeffm@suse.com> | 2010-03-23 13:35:38 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-08-13 13:20:20 -0700 |
| commit | bd91f592633c1a3ec88ac2dd55b81cde45955b1d (patch) | |
| tree | 4641a70129e3f312f4491d36fcd61d591530a6ab | |
| parent | ee0f79ddf59966d514dae5b6c9fcfca0aec46492 (diff) | |
reiserfs: fix oops while creating privroot with selinux enabled
commit 6cb4aff0a77cc0e6bae9475d62205319e3ebbf3f upstream.
Commit 57fe60df ("reiserfs: add atomic addition of selinux attributes
during inode creation") contains a bug that will cause it to oops when
mounting a file system that didn't previously contain extended attributes
on a system using security.* xattrs.
The issue is that while creating the privroot during mount
reiserfs_security_init calls reiserfs_xattr_jcreate_nblocks which
dereferences the xattr root. The xattr root doesn't exist, so we get an
oops.
Addresses http://bugzilla.kernel.org/show_bug.cgi?id=15309
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/reiserfs/xattr_security.c | 2 | ||||
| -rw-r--r-- | include/linux/reiserfs_xattr.h | 5 |
2 files changed, 6 insertions, 1 deletions
diff --git a/fs/reiserfs/xattr_security.c b/fs/reiserfs/xattr_security.c index a92c8792c0f6..b37b13b93d89 100644 --- a/fs/reiserfs/xattr_security.c +++ b/fs/reiserfs/xattr_security.c @@ -75,7 +75,7 @@ int reiserfs_security_init(struct inode *dir, struct inode *inode, return error; } - if (sec->length) { + if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) { blocks = reiserfs_xattr_jcreate_nblocks(inode) + reiserfs_xattr_nblocks(inode, sec->length); /* We don't want to count the directories twice if we have diff --git a/include/linux/reiserfs_xattr.h b/include/linux/reiserfs_xattr.h index 99928dce37ea..7fa02b4af838 100644 --- a/include/linux/reiserfs_xattr.h +++ b/include/linux/reiserfs_xattr.h @@ -70,6 +70,11 @@ int reiserfs_security_write(struct reiserfs_transaction_handle *th, void reiserfs_security_free(struct reiserfs_security_handle *sec); #endif +static inline int reiserfs_xattrs_initialized(struct super_block *sb) +{ + return REISERFS_SB(sb)->priv_root != NULL; +} + #define xattr_size(size) ((size) + sizeof(struct reiserfs_xattr_header)) static inline loff_t reiserfs_xattr_nblocks(struct inode *inode, loff_t size) { |