From f63ae56e4e97fb12053590e41a4fa59e7daa74a4 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Fri, 8 Oct 2010 09:03:07 +0200 Subject: [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 Signed-off-by: James Bottomley --- drivers/scsi/gdth.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'drivers/scsi/gdth.c') diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c index 5a3f93101017..841101846b88 100644 --- a/drivers/scsi/gdth.c +++ b/drivers/scsi/gdth.c @@ -4177,6 +4177,14 @@ 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))) -- cgit