1 files changed, 4 insertions, 1 deletions

diff --git a/fs/ufs/balloc.c b/fs/ufs/balloc.c
index 2e0021e8f366..96ca8453bab6 100644
--- a/fs/ufs/balloc.c
+++ b/fs/ufs/balloc.c
@@ -233,7 +233,7 @@ static void ufs_change_blocknr(struct inode *inode, unsigned int baseblk,
 {
         unsigned int blk_per_page = 1 << (PAGE_CACHE_SHIFT - inode->i_blkbits);
         struct address_space *mapping = inode->i_mapping;
-        pgoff_t index, cur_index = locked_page->index;
+        pgoff_t index, cur_index;
         unsigned int i, j;
         struct page *page;
         struct buffer_head *head, *bh;
@@ -241,8 +241,11 @@ static void ufs_change_blocknr(struct inode *inode, unsigned int baseblk,
         UFSD("ENTER, ino %lu, count %u, oldb %u, newb %u\n",
               inode->i_ino, count, oldb, newb);
 
+        BUG_ON(!locked_page);
         BUG_ON(!PageLocked(locked_page));
 
+        cur_index = locked_page->index;
+
         for (i = 0; i < count; i += blk_per_page) {
                 index = (baseblk+i) >> (PAGE_CACHE_SHIFT - inode->i_blkbits);