From: Yunfeng Ye <redacted>
Subject: reiserfs: prevent NULL pointer dereference in reiserfs_insert_item()

The variable inode may be NULL in reiserfs_insert_item(), but there is
no check before accessing the member of inode.

Fix this by adding NULL pointer check before calling reiserfs_debug().

Link: http://lkml.kernel.org/r/79c5135d-ff25-1cc9-4e99-9f572b88cc00@huawei.com
Signed-off-by: Yunfeng Ye <redacted>
Cc: zhengbin <redacted>
Cc: Hu Shiyuan <redacted>
Cc: Feilong Lin <redacted>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/reiserfs/stree.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/reiserfs/stree.c~reiserfs-prevent-null-pointer-dereference-in-reiserfs_insert_item
+++ a/fs/reiserfs/stree.c

@@ -2246,7 +2246,8 @@ error_out:
 	/* also releases the path */
 	unfix_nodes(&s_ins_balance);
 #ifdef REISERQUOTA_DEBUG
-	reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
+	if (inode)
+		reiserfs_debug(th->t_super, REISERFS_DEBUG_CODE,
 		       "reiserquota insert_item(): freeing %u id=%u type=%c",
 		       quota_bytes, inode->i_uid, head2type(ih));
 #endif

_