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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 <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2010-07-15 11:39:10 +09:00
parent 7c397a81fe
commit f8e6cc013b
1 changed files with 4 additions and 2 deletions
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6
fs/nilfs2/btnode.c
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@ -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;
}