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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Ocean Chen <oceanchen@google.com>,
        Chao Yu <yuchao0@huawei.com>, Jaegeuk Kim <jaegeuk@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 077/113] f2fs: avoid out-of-range memory access
Date:   Mon, 29 Jul 2019 21:22:44 +0200
Message-Id: <20190729190714.022413119@linuxfoundation.org>
In-Reply-To: <20190729190655.455345569@linuxfoundation.org>
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[ Upstream commit 56f3ce675103e3fb9e631cfb4131fc768bc23e9a ]

blkoff_off might over 512 due to fs corrupt or security
vulnerability. That should be checked before being using.

Use ENTRIES_IN_SUM to protect invalid value in cur_data_blkoff.

Signed-off-by: Ocean Chen <oceanchen@google.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 fs/f2fs/segment.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 8fc3edb6760c..92f72bb5aff4 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3261,6 +3261,11 @@ static int read_compacted_summaries(struct f2fs_sb_info *sbi)
 		seg_i = CURSEG_I(sbi, i);
 		segno = le32_to_cpu(ckpt->cur_data_segno[i]);
 		blk_off = le16_to_cpu(ckpt->cur_data_blkoff[i]);
+		if (blk_off > ENTRIES_IN_SUM) {
+			f2fs_bug_on(sbi, 1);
+			f2fs_put_page(page, 1);
+			return -EFAULT;
+		}
 		seg_i->next_segno = segno;
 		reset_curseg(sbi, i, 0);
 		seg_i->alloc_type = ckpt->alloc_type[i];
-- 
2.20.1