linux-kernel - [PATCH] udf: fix the problem that the disc content is not displayed

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Message-Id: <20210112055304.31842-1-changlianzhi@uniontech.com>
Date:   Tue, 12 Jan 2021 13:53:04 +0800
From:   lianzhi chang <changlianzhi@...ontech.com>
To:     jack@...e.com
Cc:     linux-kernel@...r.kernel.org, 282827961@...com,
        lianzhi chang <changlianzhi@...ontech.com>
Subject: [PATCH] udf: fix the problem that the disc content is not displayed

When the capacity of the disc is too large (assuming the 4.7G
specification), the disc (UDF file system) will be burned
multiple times in the windows (Multisession Usage). When the
remaining capacity of the CD is less than 300M (estimated
value, for reference only), open the CD in the Linux system,
the content of the CD is displayed as blank (the kernel will
say "No VRS found"). Windows can display the contents of the
CD normally.
Through analysis, in the "fs/udf/super.c": udf_check_vsd
function, the actual value of VSD_MAX_SECTOR_OFFSET may
be much larger than 0x800000. According to the current code
logic, it is found that the type of sbi->s_session is "__s32",
 when the remaining capacity of the disc is less than 300M
(take a set of test values: sector=3154903040,
sbi->s_session=1540464, sb->s_blocksize_bits=11 ), the
calculation result of "sbi->s_session << sb->s_blocksize_bits"
 will overflow. Therefore, it is necessary to convert the
type of s_session to "loff_t" (when udf_check_vsd starts,
assign a value to _sector, which is also converted in this
way), so that the result will not overflow, and then the
content of the disc can be displayed normally.

Signed-off-by: lianzhi chang <changlianzhi@...ontech.com>
---
 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 5bef3a68395d..6c3069cd1321 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -757,7 +757,7 @@ static int udf_check_vsd(struct super_block *sb)

 	if (nsr > 0)
 		return 1;
-	else if (!bh && sector - (sbi->s_session << sb->s_blocksize_bits) ==
+	else if (!bh && sector - ((loff_t)sbi->s_session << sb->s_blocksize_bits) ==
 			VSD_FIRST_SECTOR_OFFSET)
 		return -1;
 	else
-- 
2.20.1