linux-kernel - [PATCH] f2fs: avoid out-of-range memory access

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Message-Id: <20190702071510.158351-1-oceanchen@google.com>
Date:   Tue,  2 Jul 2019 15:15:10 +0800
From:   Ocean Chen <oceanchen@...gle.com>
To:     jaegeuk@...nel.org, yuchao0@...wei.com,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Cc:     oceanchen@...gle.com
Subject: [PATCH] f2fs: avoid out-of-range memory access

blk_off might over 512 due to fs corrupt.
Use ENTRIES_IN_SUM to protect invalid memory access.

Signed-off-by: Ocean Chen <oceanchen@...gle.com>
---
 fs/f2fs/segment.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 8dee063c833f..b83c23ebae1f 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -3403,6 +3403,8 @@ static int read_compacted_summaries(struct f2fs_sb_info *sbi)
 
 		for (j = 0; j < blk_off; j++) {
 			struct f2fs_summary *s;
+			if (blk_off >= ENTRIES_IN_SUM)
+				return -EFAULT;
 			s = (struct f2fs_summary *)(kaddr + offset);
 			seg_i->sum_blk->entries[j] = *s;
 			offset += SUMMARY_SIZE;
-- 
2.22.0.410.gd8fdbe21b5-goog