From: Dan Carpenter <dan.carpenter@oracle.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] dsp56k: prevent a harmless underflow
Date: Wed, 13 Jul 2016 10:11:19 +0000 [thread overview]
Message-ID: <20160713101119.GF29468@mwanda> (raw)
There is a mistake here where we don't allow "len" to be zero but we
allow negative lengths. It's basically harmless in this case, but the
underflow makes my static checker complain.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c
index 8bf70e8..50aa9ba 100644
--- a/drivers/char/dsp56k.c
+++ b/drivers/char/dsp56k.c
@@ -325,7 +325,7 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
if(get_user(bin, &binary->bin) < 0)
return -EFAULT;
- if (len = 0) {
+ if (len <= 0) {
return -EINVAL; /* nothing to upload?!? */
}
if (len > DSP56K_MAX_BINARY_LENGTH) {
WARNING: multiple messages have this Message-ID (diff)
From: Dan Carpenter <dan.carpenter@oracle.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org
Subject: [patch] dsp56k: prevent a harmless underflow
Date: Wed, 13 Jul 2016 13:11:19 +0300 [thread overview]
Message-ID: <20160713101119.GF29468@mwanda> (raw)
There is a mistake here where we don't allow "len" to be zero but we
allow negative lengths. It's basically harmless in this case, but the
underflow makes my static checker complain.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
diff --git a/drivers/char/dsp56k.c b/drivers/char/dsp56k.c
index 8bf70e8..50aa9ba 100644
--- a/drivers/char/dsp56k.c
+++ b/drivers/char/dsp56k.c
@@ -325,7 +325,7 @@ static long dsp56k_ioctl(struct file *file, unsigned int cmd,
if(get_user(bin, &binary->bin) < 0)
return -EFAULT;
- if (len == 0) {
+ if (len <= 0) {
return -EINVAL; /* nothing to upload?!? */
}
if (len > DSP56K_MAX_BINARY_LENGTH) {
next reply other threads:[~2016-07-13 10:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-13 10:11 Dan Carpenter [this message]
2016-07-13 10:11 ` [patch] dsp56k: prevent a harmless underflow Dan Carpenter
2016-07-13 15:01 ` Arnd Bergmann
2016-07-13 15:01 ` Arnd Bergmann
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