From f8e6cc013b896d75d6ce4ec9e168014af1257fd8 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Thu, 15 Jul 2010 11:39:10 +0900 Subject: [PATCH] nilfs2: fix buffer head leak in nilfs_btnode_submit_block nilfs_btnode_submit_block() refers to buffer head just before returning from the function, but it releases the buffer head earlier than that if nilfs_dat_translate() gets an error. This has potential for oops in the erroneous case. This fixes the issue. Signed-off-by: Ryusuke Konishi --- fs/nilfs2/btnode.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c index 447ce47a3306..0a6834bb278e 100644 --- a/fs/nilfs2/btnode.c +++ b/fs/nilfs2/btnode.c @@ -100,6 +100,7 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr, { struct buffer_head *bh; struct inode *inode = NILFS_BTNC_I(btnc); + struct page *page; int err; bh = nilfs_grab_buffer(inode, btnc, blocknr, 1 << BH_NILFS_Node); @@ -107,6 +108,7 @@ int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr, return -ENOMEM; err = -EEXIST; /* internal code */ + page = bh->b_page; if (buffer_uptodate(bh) || buffer_dirty(bh)) goto found; @@ -143,8 +145,8 @@ found: *pbh = bh; out_locked: - unlock_page(bh->b_page); - page_cache_release(bh->b_page); + unlock_page(page); + page_cache_release(page); return err; } -- 2.20.1