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reiserfs: Fix oops during mount
commit c2bb80b8bd
upstream.
With suitably crafted reiserfs image and mount command reiserfs will
crash when trying to verify that XATTR_ROOT directory can be looked up
in / as that recurses back to xattr code like:
xattr_lookup+0x24/0x280 fs/reiserfs/xattr.c:395
reiserfs_xattr_get+0x89/0x540 fs/reiserfs/xattr.c:677
reiserfs_get_acl+0x63/0x690 fs/reiserfs/xattr_acl.c:209
get_acl+0x152/0x2e0 fs/posix_acl.c:141
check_acl fs/namei.c:277 [inline]
acl_permission_check fs/namei.c:309 [inline]
generic_permission+0x2ba/0x550 fs/namei.c:353
do_inode_permission fs/namei.c:398 [inline]
inode_permission+0x234/0x4a0 fs/namei.c:463
lookup_one_len+0xa6/0x200 fs/namei.c:2557
reiserfs_lookup_privroot+0x85/0x1e0 fs/reiserfs/xattr.c:972
reiserfs_fill_super+0x2b51/0x3240 fs/reiserfs/super.c:2176
mount_bdev+0x24f/0x360 fs/super.c:1417
Fix the problem by bailing from reiserfs_xattr_get() when xattrs are not
yet initialized.
CC: stable@vger.kernel.org
Reported-by: syzbot+9b33c9b118d77ff59b6f@syzkaller.appspotmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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commit
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1 changed files with 7 additions and 0 deletions
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@ -665,6 +665,13 @@ reiserfs_xattr_get(struct inode *inode, const char *name, void *buffer,
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if (get_inode_sd_version(inode) == STAT_DATA_V1)
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return -EOPNOTSUPP;
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/*
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* priv_root needn't be initialized during mount so allow initial
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* lookups to succeed.
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*/
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if (!REISERFS_SB(inode->i_sb)->priv_root)
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return 0;
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dentry = xattr_lookup(inode, name, XATTR_REPLACE);
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if (IS_ERR(dentry)) {
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err = PTR_ERR(dentry);
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