linux-kernel - [PATCH] fix array index out of bound exception

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Date:   Wed, 11 Aug 2021 18:41:50 +0530
From:   "F.A. SULAIMAN" <asha.16@...ac.mrt.ac.lk>
To:     jack@...e.com
Cc:     "F.A.Sulaiman" <asha.16@...ac.mrt.ac.lk>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] fix array index out of bound exception

From: "F.A.Sulaiman" <asha.16@...ac.mrt.ac.lk>

Array index out of bound exception occurs when the 'part' variable is passed into the freeSpactTable array, 
this can be avoided using pointer arithmetic. 

Signed-off-by: F.A. SULAIMAN <asha.16@...ac.mrt.ac.lk>
---
 fs/udf/super.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/udf/super.c b/fs/udf/super.c
index 2f83c1204e20..d330c7162c3a 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -2522,7 +2522,7 @@ static unsigned int udf_count_free(struct super_block *sb)
 			sbi->s_lvid_bh->b_data;
 		if (le32_to_cpu(lvid->numOfPartitions) > part) {
 			accum = le32_to_cpu(
-					lvid->freeSpaceTable[part]);
+					(lvid->freeSpaceTable + part));
 			if (accum == 0xFFFFFFFF)
 				accum = 0;
 		}
-- 
2.17.1