* Coverity: btusb_work(): Null pointer dereferences
@ 2020-04-06 15:49 coverity-bot
2020-04-07 10:54 ` Narasimman, Sathish
0 siblings, 1 reply; 4+ messages in thread
From: coverity-bot @ 2020-04-06 15:49 UTC (permalink / raw)
To: Sathish Narasimman
Cc: Marcel Holtmann, Chethan T N, kbuild test robot, Amit K Bag,
Hsin-Yu Chao, Johan Hedberg, Gustavo A. R. Silva, linux-next
Hello!
This is an experimental automated report about issues detected by Coverity
from a scan of next-20200406 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan
You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by recent commits:
baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB Endpoints")
Coverity reported the following:
*** CID 1492498: Null pointer dereferences (FORWARD_NULL)
/drivers/bluetooth/btusb.c: 1665 in btusb_work()
1659 }
1660 } else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
1661
1662 data->usb_alt6_packet_flow = true;
1663
1664 /* Check if Alt 6 is supported for Transparent audio */
vvv CID 1492498: Null pointer dereferences (FORWARD_NULL)
vvv Passing "data" to "btusb_find_altsetting", which dereferences null "data->isoc".
1665 if (btusb_find_altsetting(data, 6))
1666 new_alts = 6;
1667 else
1668 bt_dev_err(hdev, "Device does not support ALT setting 6");
1669 }
1670
If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include these lines (but double-check the "Fixes" first):
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1492498 ("Null pointer dereferences")
Fixes: baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB Endpoints")
Thanks for your attention!
--
Coverity-bot
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: Coverity: btusb_work(): Null pointer dereferences
2020-04-06 15:49 Coverity: btusb_work(): Null pointer dereferences coverity-bot
@ 2020-04-07 10:54 ` Narasimman, Sathish
2020-04-07 18:14 ` Kees Cook
0 siblings, 1 reply; 4+ messages in thread
From: Narasimman, Sathish @ 2020-04-07 10:54 UTC (permalink / raw)
To: coverity-bot
Cc: Marcel Holtmann, Tumkur Narayan, Chethan, lkp, Bag, Amit K,
Hsin-Yu Chao, Hedberg, Johan, Gustavo A. R. Silva, linux-next
Hi
I think this is False Positive.
In the function btusb_probe the memory allocation is happened and verified for NULL.
I don't this so checking for NULL evey time is required.
Sample code snip
In function "btusb_probe"
{
data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
....
INIT_WORK(&data->work, btusb_work);
}
Regards
Sathish N
-----Original Message-----
From: coverity-bot <keescook@chromium.org>
Sent: Monday, April 6, 2020 9:20 PM
To: Narasimman, Sathish <sathish.narasimman@intel.com>
Cc: Marcel Holtmann <marcel@holtmann.org>; Tumkur Narayan, Chethan <chethan.tumkur.narayan@intel.com>; lkp <lkp@intel.com>; Bag, Amit K <amit.k.bag@intel.com>; Hsin-Yu Chao <hychao@chromium.org>; Hedberg, Johan <johan.hedberg@intel.com>; Gustavo A. R. Silva <gustavo@embeddedor.com>; linux-next@vger.kernel.org
Subject: Coverity: btusb_work(): Null pointer dereferences
Hello!
This is an experimental automated report about issues detected by Coverity from a scan of next-20200406 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan
You're getting this email because you were associated with the identified lines of code (noted below) that were touched by recent commits:
baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB Endpoints")
Coverity reported the following:
*** CID 1492498: Null pointer dereferences (FORWARD_NULL)
/drivers/bluetooth/btusb.c: 1665 in btusb_work()
1659 }
1660 } else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
1661
1662 data->usb_alt6_packet_flow = true;
1663
1664 /* Check if Alt 6 is supported for Transparent audio */
vvv CID 1492498: Null pointer dereferences (FORWARD_NULL)
vvv Passing "data" to "btusb_find_altsetting", which dereferences null "data->isoc".
1665 if (btusb_find_altsetting(data, 6))
1666 new_alts = 6;
1667 else
1668 bt_dev_err(hdev, "Device does not support ALT setting 6");
1669 }
1670
If this is a false positive, please let us know so we can mark it as such, or teach the Coverity rules to be smarter. If not, please make sure fixes get into linux-next. :) For patches fixing this, please include these lines (but double-check the "Fixes" first):
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1492498 ("Null pointer dereferences")
Fixes: baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB Endpoints")
Thanks for your attention!
--
Coverity-bot
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Coverity: btusb_work(): Null pointer dereferences
2020-04-07 10:54 ` Narasimman, Sathish
@ 2020-04-07 18:14 ` Kees Cook
2020-04-08 7:38 ` Narasimman, Sathish
0 siblings, 1 reply; 4+ messages in thread
From: Kees Cook @ 2020-04-07 18:14 UTC (permalink / raw)
To: Narasimman, Sathish
Cc: Marcel Holtmann, Tumkur Narayan, Chethan, lkp, Bag, Amit K,
Hsin-Yu Chao, Hedberg, Johan, Gustavo A. R. Silva, linux-next
On Tue, Apr 07, 2020 at 10:54:22AM +0000, Narasimman, Sathish wrote:
> Hi
>
> I think this is False Positive.
>
> In the function btusb_probe the memory allocation is happened and verified for NULL.
> I don't this so checking for NULL evey time is required.
>
> Sample code snip
>
> In function "btusb_probe"
> {
> data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
> if (!data)
> return -ENOMEM;
> ....
> INIT_WORK(&data->work, btusb_work);
>
> }
This warning is talking about data->isoc, which is checked for NULL in
other places before the call to btusb_find_altsetting(), which doesn't
check for NULL.
-Kees
>
>
> Regards
> Sathish N
>
> -----Original Message-----
> From: coverity-bot <keescook@chromium.org>
> Sent: Monday, April 6, 2020 9:20 PM
> To: Narasimman, Sathish <sathish.narasimman@intel.com>
> Cc: Marcel Holtmann <marcel@holtmann.org>; Tumkur Narayan, Chethan <chethan.tumkur.narayan@intel.com>; lkp <lkp@intel.com>; Bag, Amit K <amit.k.bag@intel.com>; Hsin-Yu Chao <hychao@chromium.org>; Hedberg, Johan <johan.hedberg@intel.com>; Gustavo A. R. Silva <gustavo@embeddedor.com>; linux-next@vger.kernel.org
> Subject: Coverity: btusb_work(): Null pointer dereferences
>
> Hello!
>
> This is an experimental automated report about issues detected by Coverity from a scan of next-20200406 as part of the linux-next weekly scan project:
> https://scan.coverity.com/projects/linux-next-weekly-scan
>
> You're getting this email because you were associated with the identified lines of code (noted below) that were touched by recent commits:
>
> baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB Endpoints")
>
> Coverity reported the following:
>
> *** CID 1492498: Null pointer dereferences (FORWARD_NULL)
> /drivers/bluetooth/btusb.c: 1665 in btusb_work()
> 1659 }
> 1660 } else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
> 1661
> 1662 data->usb_alt6_packet_flow = true;
> 1663
> 1664 /* Check if Alt 6 is supported for Transparent audio */
> vvv CID 1492498: Null pointer dereferences (FORWARD_NULL)
> vvv Passing "data" to "btusb_find_altsetting", which dereferences null "data->isoc".
> 1665 if (btusb_find_altsetting(data, 6))
> 1666 new_alts = 6;
> 1667 else
> 1668 bt_dev_err(hdev, "Device does not support ALT setting 6");
> 1669 }
> 1670
>
> If this is a false positive, please let us know so we can mark it as such, or teach the Coverity rules to be smarter. If not, please make sure fixes get into linux-next. :) For patches fixing this, please include these lines (but double-check the "Fixes" first):
>
> Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
> Addresses-Coverity-ID: 1492498 ("Null pointer dereferences")
> Fixes: baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB Endpoints")
>
>
> Thanks for your attention!
>
> --
> Coverity-bot
--
Kees Cook
^ permalink raw reply [flat|nested] 4+ messages in thread
* RE: Coverity: btusb_work(): Null pointer dereferences
2020-04-07 18:14 ` Kees Cook
@ 2020-04-08 7:38 ` Narasimman, Sathish
0 siblings, 0 replies; 4+ messages in thread
From: Narasimman, Sathish @ 2020-04-08 7:38 UTC (permalink / raw)
To: Kees Cook
Cc: Marcel Holtmann, Tumkur Narayan, Chethan, lkp, Bag, Amit K,
Hsin-Yu Chao, Hedberg, Johan, Gustavo A. R. Silva, linux-next
Hi
Respective Fix for this updated and merged in Bluetooth-next.
Thanks
Sathish N
-----Original Message-----
From: Kees Cook <keescook@chromium.org>
Sent: Tuesday, April 7, 2020 11:44 PM
To: Narasimman, Sathish <sathish.narasimman@intel.com>
Cc: Marcel Holtmann <marcel@holtmann.org>; Tumkur Narayan, Chethan <chethan.tumkur.narayan@intel.com>; lkp <lkp@intel.com>; Bag, Amit K <amit.k.bag@intel.com>; Hsin-Yu Chao <hychao@chromium.org>; Hedberg, Johan <johan.hedberg@intel.com>; Gustavo A. R. Silva <gustavo@embeddedor.com>; linux-next@vger.kernel.org
Subject: Re: Coverity: btusb_work(): Null pointer dereferences
On Tue, Apr 07, 2020 at 10:54:22AM +0000, Narasimman, Sathish wrote:
> Hi
>
> I think this is False Positive.
>
> In the function btusb_probe the memory allocation is happened and verified for NULL.
> I don't this so checking for NULL evey time is required.
>
> Sample code snip
>
> In function "btusb_probe"
> {
> data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);
> if (!data)
> return -ENOMEM;
> ....
> INIT_WORK(&data->work, btusb_work);
>
> }
This warning is talking about data->isoc, which is checked for NULL in other places before the call to btusb_find_altsetting(), which doesn't check for NULL.
-Kees
>
>
> Regards
> Sathish N
>
> -----Original Message-----
> From: coverity-bot <keescook@chromium.org>
> Sent: Monday, April 6, 2020 9:20 PM
> To: Narasimman, Sathish <sathish.narasimman@intel.com>
> Cc: Marcel Holtmann <marcel@holtmann.org>; Tumkur Narayan, Chethan
> <chethan.tumkur.narayan@intel.com>; lkp <lkp@intel.com>; Bag, Amit K
> <amit.k.bag@intel.com>; Hsin-Yu Chao <hychao@chromium.org>; Hedberg,
> Johan <johan.hedberg@intel.com>; Gustavo A. R. Silva
> <gustavo@embeddedor.com>; linux-next@vger.kernel.org
> Subject: Coverity: btusb_work(): Null pointer dereferences
>
> Hello!
>
> This is an experimental automated report about issues detected by Coverity from a scan of next-20200406 as part of the linux-next weekly scan project:
> https://scan.coverity.com/projects/linux-next-weekly-scan
>
> You're getting this email because you were associated with the identified lines of code (noted below) that were touched by recent commits:
>
> baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB
> Endpoints")
>
> Coverity reported the following:
>
> *** CID 1492498: Null pointer dereferences (FORWARD_NULL)
> /drivers/bluetooth/btusb.c: 1665 in btusb_work()
> 1659 }
> 1660 } else if (data->air_mode == HCI_NOTIFY_ENABLE_SCO_TRANSP) {
> 1661
> 1662 data->usb_alt6_packet_flow = true;
> 1663
> 1664 /* Check if Alt 6 is supported for Transparent audio */
> vvv CID 1492498: Null pointer dereferences (FORWARD_NULL)
> vvv Passing "data" to "btusb_find_altsetting", which dereferences null "data->isoc".
> 1665 if (btusb_find_altsetting(data, 6))
> 1666 new_alts = 6;
> 1667 else
> 1668 bt_dev_err(hdev, "Device does not support ALT setting 6");
> 1669 }
> 1670
>
> If this is a false positive, please let us know so we can mark it as such, or teach the Coverity rules to be smarter. If not, please make sure fixes get into linux-next. :) For patches fixing this, please include these lines (but double-check the "Fixes" first):
>
> Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
> Addresses-Coverity-ID: 1492498 ("Null pointer dereferences")
> Fixes: baac6276c0a9 ("Bluetooth: btusb: handle mSBC audio over USB
> Endpoints")
>
>
> Thanks for your attention!
>
> --
> Coverity-bot
--
Kees Cook
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2020-04-08 7:38 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2020-04-06 15:49 Coverity: btusb_work(): Null pointer dereferences coverity-bot
2020-04-07 10:54 ` Narasimman, Sathish
2020-04-07 18:14 ` Kees Cook
2020-04-08 7:38 ` Narasimman, Sathish
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