Commit ec160ad2 authored Dec 19, 2016 by Yunlei He Committed by Greg Kroah-Hartman Mar 12, 2017

f2fs: fix a problem of using memory after free



commit 7855eba4d6102f811b6dd142d6c749f53b591fa3 upstream.

This patch fix a problem of using memory after free
in function __try_merge_extent_node.

Fixes: 0f825ee6 ("f2fs: add new interfaces for extent tree")
Signed-off-by: Yunlei He <heyunlei@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent d78f9338

fs/f2fs/extent_cache.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -352,11 +352,12 @@ static struct extent_node __try_merge_extent_node(struct inode inode,
		}

		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;
		}