f2fs: read page index before freeing

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: bf39c00 ("f2fs: drop obsolete node page when it is truncated") Cc: <[email protected]> Signed-off-by: Pan Bian <[email protected]> Reviewed-by: Chao Yu <[email protected]> Signed-off-by: Jaegeuk Kim <[email protected]>
adn770 · Nov 26, 2018 · 0ea295d · 0ea295d
1 parent f617647
commit 0ea295d
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
@@ -826,6 +826,7 @@ static int truncate_node(struct dnode_of_data *dn)
 	struct f2fs_sb_info *sbi = F2FS_I_SB(dn->inode);
 	struct node_info ni;
 	int err;
+	pgoff_t index;
 
 	err = f2fs_get_node_info(sbi, dn->nid, &ni);
 	if (err)
@@ -845,10 +846,11 @@ static int truncate_node(struct dnode_of_data *dn)
 	clear_node_page_dirty(dn->node_page);
 	set_sbi_flag(sbi, SBI_IS_DIRTY);
 
+	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);