f2fs: fix a problem of using memory after free
This patch fix a problem of using memory after free
in function __try_merge_extent_node.
Fixes: 0f825ee6e873 ("f2fs: add new interfaces for extent tree")
Cc: <stable@vger.kernel.org>
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/extent_cache.c b/fs/f2fs/extent_cache.c
index 4db44da..e02c3d8 100644
--- a/fs/f2fs/extent_cache.c
+++ b/fs/f2fs/extent_cache.c
@@ -352,11 +352,12 @@
}
if (next_ex && __is_front_mergeable(ei, &next_ex->ei)) {
- if (en)
- __release_extent_node(sbi, et, prev_ex);
next_ex->ei.fofs = ei->fofs;
next_ex->ei.blk = ei->blk;
next_ex->ei.len += ei->len;
+ if (en)
+ __release_extent_node(sbi, et, prev_ex);
+
en = next_ex;
}