lkml.org 
[lkml]   [2016]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: UBSAN whinge in ihci-hub.c
From
2016-05-18 1:16 GMT+03:00 Greg Kroah-Hartman <gregkh@linuxfoundation.org>:
> On Tue, May 17, 2016 at 05:52:40PM -0400, Valdis Kletnieks wrote:
>> So, not content in the amount of breakage I generate already, I
>> compiled with UBSAN enabled...
>>
>> The immediately relevant part:
>>
>> [ 2.418576] ================================================================================
>> [ 2.418579] UBSAN: Undefined behaviour in drivers/usb/host/ehci-hub.c:877:47
>> [ 2.418582] index -1 is out of range for type 'u32 [1]'
>
> <snip>
>
> It's a known bug in ubsan,

It's not a bug. int *p = &a[-1] is undefined behavior. It doesn't
matter whether that pointer dereferenced or not.

\
 
 \ /
  Last update: 2016-05-18 10:21    [W:0.068 / U:0.472 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site