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| author | Dan Carpenter <error27@gmail.com> | 2010-10-08 09:03:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-11-22 10:43:10 -0800 |
| commit | c47f5a57a00ee2aa37130d128ae21ee8700dde4d (patch) | |
| tree | 1edaf95fb38b59e6778314bc7f6ee41ec10a6f9d | |
| parent | 2415dee59572d39bd24175c772ab00b70b94afe6 (diff) | |
| download | lwn-c47f5a57a00ee2aa37130d128ae21ee8700dde4d.tar.gz lwn-c47f5a57a00ee2aa37130d128ae21ee8700dde4d.zip | |
gdth: integer overflow in ioctl
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 <error27@gmail.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | 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 4015499dad2a..1ce247199dd3 100644 --- a/drivers/scsi/gdth.c +++ b/drivers/scsi/gdth.c @@ -4155,6 +4155,14 @@ 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))) |