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Groups > linux.kernel > #1467856
| From | Alan Stern <stern@rowland.harvard.edu> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 |
| Date | 2016-08-22 19:50 +0200 |
| Message-ID | <s91we-Tx-13@gated-at.bofh.it> (permalink) |
| References | <s8yud-7DA-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Sun, 21 Aug 2016, Jiri Slaby wrote: > Cc: proper lists. > > ep->desc.bInterval seems to be 0 here. > > On 08/21/2016, 12:42 PM, Vittorio Zecca wrote: > > I am not sure this is the right place so please bear with me... > > From Vittorio Zecca > > > > After compiling kernel 4.7.2 with ubsan I got the following messages > > at boot time: > > > > (devio.c:1713 is "as->urb->interval = 1 << min(15, ep->desc.bInterval - 1);") > > > > [ +0.354486] ================================================================================ > > [ +0.000008] UBSAN: Undefined behaviour in > > /home/vitti/1tb/vitti/rpmbuild/SOURCES/linux-4.7.2/drivers/usb/core/devio.c:1713:25 > > [ +0.000004] shift exponent -1 is negative As far as I can see, this isn't possible. The usb_parse_endpoint() routine in drivers/usb/core/config.c is supposed to guarantee that ep->desc.bInterval is never 0. More information from Vittorio would be helpful. For example, what shows up in /sys/kernel/debug/usb/devices (after mounting a debugfs filesystem on /sys/kernel/debug)? Alan Stern
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Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Jiri Slaby <jslaby@suse.cz> - 2016-08-21 12:50 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Alan Stern <stern@rowland.harvard.edu> - 2016-08-22 19:50 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Bjørn Mork <bjorn@mork.no> - 2016-08-22 22:30 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Alan Stern <stern@rowland.harvard.edu> - 2016-08-22 22:50 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Bjørn Mork <bjorn@mork.no> - 2016-08-22 23:00 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Alan Stern <stern@rowland.harvard.edu> - 2016-08-22 23:10 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Vittorio Zecca <zeccav@gmail.com> - 2016-08-22 23:50 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Alan Stern <stern@rowland.harvard.edu> - 2016-08-23 17:10 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Vittorio Zecca <zeccav@gmail.com> - 2016-08-23 18:00 +0200
Re: UBSAN: Undefined behaviour in linux-4.7.2/drivers/usb/core/devio.c:1713:25 Alan Stern <stern@rowland.harvard.edu> - 2016-08-23 21:00 +0200
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