From: Dan Carpenter <dan.carpenter@oracle.com>
To: Derek Kiernan <derek.kiernan@xilinx.com>,
Dragan Cvetic <dragan.cvetic@xilinx.com>
Cc: Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
kernel-janitors@vger.kernel.org,
Michal Simek <michal.simek@xilinx.com>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/4] misc: xilinx_sdfec: Prevent a divide by zero in xsdfec_reg0_write()
Date: Wed, 21 Aug 2019 10:09:53 +0300 [thread overview]
Message-ID: <20190821070953.GC26957@mwanda> (raw)
In-Reply-To: <20190821070606.GA26957@mwanda>
The "psize" value comes from the user so we need to verify that it's
non-zero before we check if "n % psize" or it will crash.
Fixes: 20ec628e8007 ("misc: xilinx_sdfec: Add ability to configure LDPC")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
The parentheses in this condition are a no-op. They're just confusing.
Perhaps something else was intended?
drivers/misc/xilinx_sdfec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index 813b82c59360..3fc53d20abf3 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -460,7 +460,7 @@ static int xsdfec_reg0_write(struct xsdfec_dev *xsdfec, u32 n, u32 k, u32 psize,
{
u32 wdata;
- if (n < XSDFEC_REG0_N_MIN || n > XSDFEC_REG0_N_MAX ||
+ if (n < XSDFEC_REG0_N_MIN || n > XSDFEC_REG0_N_MAX || psize == 0 ||
(n > XSDFEC_REG0_N_MUL_P * psize) || n <= k || ((n % psize) != 0)) {
dev_dbg(xsdfec->dev, "N value is not in range");
return -EINVAL;
--
2.20.1
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next prev parent reply other threads:[~2019-08-21 7:10 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-21 7:06 [PATCH 1/4] misc: xilinx_sdfec: Fix a couple small information leaks Dan Carpenter
2019-08-21 7:07 ` [PATCH 2/4] misc: xilinx_sdfec: Return -EFAULT if copy_from_user() fails Dan Carpenter
2019-08-22 8:16 ` Michal Simek
2019-08-22 8:31 ` [PATCH 2/4 v2] " Dan Carpenter
2019-08-22 17:47 ` [PATCH 2/4] " Dragan Cvetic
2019-08-21 7:09 ` Dan Carpenter [this message]
2019-08-22 8:18 ` [PATCH 3/4] misc: xilinx_sdfec: Prevent a divide by zero in xsdfec_reg0_write() Michal Simek
2019-08-23 8:23 ` Dragan Cvetic
2019-08-21 7:11 ` [PATCH 4/4] misc: xilinx_sdfec: Prevent integer overflow in xsdfec_table_write() Dan Carpenter
2019-08-22 8:27 ` Michal Simek
2019-08-22 17:55 ` Dragan Cvetic
2019-08-22 8:14 ` [PATCH 1/4] misc: xilinx_sdfec: Fix a couple small information leaks Michal Simek
2019-08-22 8:28 ` Dan Carpenter
2019-08-22 8:49 ` Michal Simek
2019-08-22 17:47 ` Dragan Cvetic
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