From 8908e753109fd7abb4949a3d6118a9a5e3766ea0 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Thu, 26 Mar 2020 17:42:26 +0800 Subject: 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 Signed-off-by: Jaegeuk Kim --- fs/f2fs/compress.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'fs') diff --git a/fs/f2fs/compress.c b/fs/f2fs/compress.c index ca4f54fbbd2e..df7b2d15eacd 100644 --- a/fs/f2fs/compress.c +++ b/fs/f2fs/compress.c @@ -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]); } -- cgit