Hi Dan, On 3/4/19 4:04 PM, Dan Carpenter wrote: > Hi Tomas, > > url: https://github.com/0day-ci/linux/commits/Tomas-Bortoli/net-bluetooth-Fix-bound-check-in-event-handling/20190301-213647 > base: https://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next.git master > > smatch warnings: > net/bluetooth/hci_event.c:3986 hci_inquiry_result_with_rssi_evt() warn: potential pointer math issue ('info' is a 120 bit pointer) > > # https://github.com/0day-ci/linux/commit/00305742c021794f147b348d45eb10ea26e5a514 > git remote add linux-review https://github.com/0day-ci/linux > git remote update linux-review > git checkout 00305742c021794f147b348d45eb10ea26e5a514 > vim +3986 net/bluetooth/hci_event.c > > a9de9248 Marcel Holtmann 2007-10-20 3979 if ((skb->len - 1) / num_rsp != sizeof(struct inquiry_info_with_rssi)) { > 138d22ef Szymon Janc 2011-02-17 3980 struct inquiry_info_with_rssi_and_pscan_mode *info; > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > 138d22ef Szymon Janc 2011-02-17 3981 info = (void *) (skb->data + 1); > a9de9248 Marcel Holtmann 2007-10-20 3982 > e17acd40 Johan Hedberg 2011-03-30 3983 for (; num_rsp; num_rsp--, info++) { > af58925c Marcel Holtmann 2014-07-01 3984 u32 flags; > af58925c Marcel Holtmann 2014-07-01 3985 > 00305742 Tomas Bortoli 2019-02-28 @3986 if ((void *)(info + sizeof(info)) > > ^^^^^^^^^^^^^^^^^^^ > This is a pointer math bug. The options to fix it are: > > if ((void *)info + sizeof(info) > Yes, also sizeof(info) should be sizeof(*info).. > > Or: > if ((void *)(info + 1) > > > > 00305742 Tomas Bortoli 2019-02-28 3987 (void *)(skb->data + skb->len)) > 00305742 Tomas Bortoli 2019-02-28 3988 break; > 00305742 Tomas Bortoli 2019-02-28 3989 > a9de9248 Marcel Holtmann 2007-10-20 3990 bacpy(&data.bdaddr, &info->bdaddr); > a9de9248 Marcel Holtmann 2007-10-20 3991 data.pscan_rep_mode = info->pscan_rep_mode; > a9de9248 Marcel Holtmann 2007-10-20 3992 data.pscan_period_mode = info->pscan_period_mode; > a9de9248 Marcel Holtmann 2007-10-20 3993 data.pscan_mode = info->pscan_mode; > a9de9248 Marcel Holtmann 2007-10-20 3994 memcpy(data.dev_class, info->dev_class, 3); > a9de9248 Marcel Holtmann 2007-10-20 3995 data.clock_offset = info->clock_offset; > a9de9248 Marcel Holtmann 2007-10-20 3996 data.rssi = info->rssi; > 41a96212 Marcel Holtmann 2008-07-14 3997 data.ssp_mode = 0x00; > 3175405b Johan Hedberg 2012-01-04 3998 > > regards, > dan carpenter > > --- > 0-DAY kernel test infrastructure Open Source Technology Center > https://lists.01.org/pipermail/kbuild-all Intel Corporation > regards, Tomas
