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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: 61fbae2b2b ("f2fs: fix to avoid NULL pointer dereference")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu 2020-03-26 17:42:26 +08:00 committed by Jaegeuk Kim
parent fd26725f6e
commit 8908e75310
1 changed files with 2 additions and 0 deletions
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2
fs/f2fs/compress.c
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@ -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]);
}