[patch] gdth: integer overflow in ioctl

[patch] gdth: integer overflow in ioctl

[Dan Carpenter]

gdth_ioctl_alloc() takes the size variable as an int.
copy_from_user() takes the size variable as an unsigned long.
gen.data_len and gen.sense_len are unsigned longs.
On x86_64 longs are 64 bit and ints are 32 bit.

We could pass in a very large number and the allocation would truncate
the size to 32 bits and allocate a small buffer.  Then when we do the
copy_from_user(), it would result in a memory corruption.

CC: stable@kernel.org
Signed-off-by: Dan Carpenter <error27@gmail.com>

diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c
index b860d65..4cf7ffa 100644
--- a/drivers/scsi/gdth.c
+++ b/drivers/scsi/gdth.c
@@ -4175,6 +4175,14 @@ static int ioc_general(void __user *arg, char *cmnd)
     ha = gdth_find_ha(gen.ionode);
     if (!ha)
         return -EFAULT;
+
+    if (gen.data_len > INT_MAX)
+        return -EINVAL;
+    if (gen.sense_len > INT_MAX)
+        return -EINVAL;
+    if (gen.data_len + gen.sense_len > INT_MAX)
+        return -EINVAL;
+
     if (gen.data_len + gen.sense_len != 0) {
         if (!(buf = gdth_ioctl_alloc(ha, gen.data_len + gen.sense_len,
                                      FALSE, &paddr)))

Re: [patch] gdth: integer overflow in ioctl

[Dan Carpenter]

On Fri, Oct 08, 2010 at 09:03:07AM +0200, Dan Carpenter wrote:
> gdth_ioctl_alloc() takes the size variable as an int.
> copy_from_user() takes the size variable as an unsigned long.
> gen.data_len and gen.sense_len are unsigned longs.
> On x86_64 longs are 64 bit and ints are 32 bit.
> 
> We could pass in a very large number and the allocation would truncate
> the size to 32 bits and allocate a small buffer.  Then when we do the
> copy_from_user(), it would result in a memory corruption.
> 
> CC: stable@kernel.org
> Signed-off-by: Dan Carpenter <error27@gmail.com>
> 

I never know if anyone gets my emails and so I has a small sad face on
the front of my head here: --------------->   :(

regards,
dan carpenter