lkml.org 
[lkml]   [2013]   [Jun]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH V2] dtc: ensure #line directives don't consume data from the next line
On Fri, May 31, 2013 at 12:33:04PM -0600, Stephen Warren wrote:
> From: Stephen Warren <swarren@nvidia.com>
>
> Previously, the #line parsing regex ended with ({WS}+[0-9]+)?. The {WS}
> could match line-break characters. If the #line directive did not contain
> the optional flags field at the end, this could cause any integer data on
> the next line to be consumed as part of the #line directive parsing. This
> could cause syntax errors (i.e. #line parsing consuming the leading 0
> from a hex literal 0x1234, leaving x1234 to be parsed as cell data,
> which is a syntax error), or invalid compilation results (i.e. simply
> consuming literal 1234 as part of the #line processing, thus removing it
> from the cell data).
>
> Fix this by replacing {WS} with [ \t] so that it can't match line-breaks.
>
> Convert all instances of {WS}, even though the other instances should be
> irrelevant for any well-formed #line directive. This is done for
> consistency and ultimate safety.
>
> Reported-by: Ian Campbell <Ian.Campbell@citrix.com>
> Signed-off-by: Stephen Warren <swarren@nvidia.com>

Nice catch.

Acked-by: David Gibson <david@gibson.dropbear.id.au>

I'll pull it into my github tree. Jon, please either apply directly
or pull from my tree.

--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2013-06-01 08:21    [W:0.054 / U:0.136 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site