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authorDan Carpenter <error27@gmail.com>2010-10-08 11:03:07 +0400
committerJames Bottomley <James.Bottomley@suse.de>2010-10-26 00:01:14 +0400
commitf63ae56e4e97fb12053590e41a4fa59e7daa74a4 (patch)
treee5087c68ff1c9387a8bed84e4b2ab30d19e02852 /drivers/scsi/gdth.c
parent546ae796bfac6399e30da4b5af2cf7a6d0f8a4ec (diff)
downloadlinux-f63ae56e4e97fb12053590e41a4fa59e7daa74a4.tar.xz
[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>
Diffstat (limited to 'drivers/scsi/gdth.c')
-rw-r--r--drivers/scsi/gdth.c8
1 files changed, 8 insertions, 0 deletions
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)))