From: Ocean Chen via Linux-f2fs-devel <linux-f2fs-devel@lists.sourceforge.net>
To: jaegeuk@kernel.org, yuchao0@huawei.com,
linux-f2fs-devel@lists.sourceforge.net,
linux-kernel@vger.kernel.org
Cc: oceanchen@google.com
Subject: [f2fs-dev] [PATCH] f2fs: avoid out-of-range memory access
Date: Tue, 2 Jul 2019 15:15:10 +0800 [thread overview]
Message-ID: <20190702071510.158351-1-oceanchen@google.com> (raw)
blk_off might over 512 due to fs corrupt.
Use ENTRIES_IN_SUM to protect invalid memory access.
Signed-off-by: Ocean Chen <oceanchen@google.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
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reply other threads:[~2019-07-02 7:39 UTC|newest]
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