From: Dan Carpenter <[email protected]> commit f63ae56e4e97fb12053590e41a4fa59e7daa74a4 upstream.
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. Signed-off-by: Dan Carpenter <[email protected]> Signed-off-by: James Bottomley <[email protected]> Signed-off-by: Paul Gortmaker <[email protected]> --- drivers/scsi/gdth.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/drivers/scsi/gdth.c b/drivers/scsi/gdth.c index 35a4b30..a8da7e8 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))) -- 1.7.3.3 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
