linux-kernel - [PATCH] hfs: fix array out of bounds read of array extent

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Date:   Fri, 31 Aug 2018 15:05:38 +0100
From:   Colin King <colin.king@...onical.com>
To:     linux-fsdevel@...r.kernel.org, dhowells@...hat.com,
        viro@...iv.linux.org.uk
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] hfs: fix array out of bounds read of array extent

From: Colin Ian King <colin.king@...onical.com>

Currently extent and index i are both being incremented causing
an array out of bounds read on extent[i]. Fix this by removing
the extraneous increment of extent.

Detected by CoverityScan, CID#711541 ("Out of bounds read")

Fixes: d1081202f1d0 ("HFS rewrite")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 fs/hfs/extent.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hfs/extent.c b/fs/hfs/extent.c
index 5d0182654580..636cdfcecb26 100644
--- a/fs/hfs/extent.c
+++ b/fs/hfs/extent.c
@@ -300,7 +300,7 @@ int hfs_free_fork(struct super_block *sb, struct hfs_cat_file *file, int type)
 		return 0;
 
 	blocks = 0;
-	for (i = 0; i < 3; extent++, i++)
+	for (i = 0; i < 3; i++)
 		blocks += be16_to_cpu(extent[i].count);
 
 	res = hfs_free_extents(sb, extent, blocks, blocks);
-- 
2.17.1