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.ryus...@lab.ntt.co.jp>
---
fs/nilfs2/btnode.c | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 447ce47..0a6834b 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;
}
--
1.6.6.2
--
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