diff options
| -rw-r--r-- | drivers/message/i2o/i2o_config.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/message/i2o/i2o_config.c b/drivers/message/i2o/i2o_config.c index 098de2b35784..9a49c243a6ac 100644 --- a/drivers/message/i2o/i2o_config.c +++ b/drivers/message/i2o/i2o_config.c @@ -188,6 +188,13 @@ static int i2o_cfg_parms(unsigned long arg, unsigned int type) if (!dev) return -ENXIO; + /* + * Stop users being able to try and allocate arbitary amounts + * of DMA space. 64K is way more than sufficient for this. + */ + if (kcmd.oplen > 65536) + return -EMSGSIZE; + ops = memdup_user(kcmd.opbuf, kcmd.oplen); if (IS_ERR(ops)) return PTR_ERR(ops); |