tree e5087c68ff1c9387a8bed84e4b2ab30d19e02852
parent 546ae796bfac6399e30da4b5af2cf7a6d0f8a4ec
author Dan Carpenter <error27@gmail.com> 1286521387 +0200
committer James Bottomley <James.Bottomley@suse.de> 1288036874 -0500

[SCSI] gdth: integer overflow in ioctl

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>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>