3.16.65-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Pan Bian <bianpan2016@xxxxxxx>
commit 0ea295dd853e0879a9a30ab61f923c26be35b902 upstream.
The function truncate_node frees the page with f2fs_put_page. However,
the page index is read after that. So, the patch reads the index before
freeing the page.
Fixes: bf39c00a9a7f ("f2fs: drop obsolete node page when it is truncated")
Signed-off-by: Pan Bian <bianpan2016@xxxxxxx>
Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>
Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
fs/f2fs/node.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -509,6 +509,7 @@ static void truncate_node(struct dnode_o
{
struct f2fs_sb_info *sbi = F2FS_SB(dn->inode->i_sb);
struct node_info ni;
+ pgoff_t index;
get_node_info(sbi, dn->nid, &ni);
if (dn->inode->i_blocks == 0) {
@@ -532,10 +533,11 @@ invalidate:
clear_node_page_dirty(dn->node_page);
F2FS_SET_SB_DIRT(sbi);
+ index = dn->node_page->index;
f2fs_put_page(dn->node_page, 1);
invalidate_mapping_pages(NODE_MAPPING(sbi),
- dn->node_page->index, dn->node_page->index);
+ index, index);
dn->node_page = NULL;
trace_f2fs_truncate_node(dn->inode, dn->nid, ni.blk_addr);
