Commit ea49be2a authored Mar 26, 2020 by Chao Yu Committed by Jaegeuk Kim Apr 06, 2020

f2fs: fix to verify tpage before releasing in f2fs_free_dic()



In below error path, tpages[i] could be NULL, fix to check it before
releasing it.
- f2fs_read_multi_pages
 - f2fs_alloc_dic
  - f2fs_free_dic

Fixes: 61fbae2b2b12 ("f2fs: fix to avoid NULL pointer dereference")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

parent 7334507a

fs/f2fs/compress.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -1333,6 +1333,8 @@ void f2fs_free_dic(struct decompress_io_ctx *dic)
		for (i = 0; i < dic->cluster_size; i++) {
		if (dic->rpages[i])
		continue;
		if (!dic->tpages[i])
		continue;
		unlock_page(dic->tpages[i]);
		put_page(dic->tpages[i]);
		}