[perl #129176] Conditional jump depends on uninitialized values inS_scan_heredoc

On Fri Sep 02 13:38:21 2016, dcollinsn@gmail.com wrote:
> $ perl -e 'print "<<`\\"' | valgrind ../bin/perl
...
> Can't find string terminator "\" anywhere before EOF at - line 1.

Wrong error message.

delimcpy (used to find the end of the `\... after <<) is going one byte past the end of the buffer passed to it, because the trailing null is ‘escaped’ with a backslash.  delimcpy needs fixing.

scan_heredoc perfectly reasonably croaks only if s==PL_bufend, since if s<PL_bufend the terminating ` was found.  In this case s>PL_bufend, which would not happen with a properly functioning delimcpy.

-- 

Father Chrysostomos


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via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=129176

• [perl #129176] Conditional jump depends on uninitialized values inS_scan_heredoc by Father Chrysostomos via RT
• Re: [perl #129176] Conditional jump depends on uninitialized valuesin S_scan_heredoc by Dave Mitchell
• [perl #129176] Conditional jump depends on uninitialized values inS_scan_heredoc by Father Chrysostomos via RT
• Re: [perl #129176] Conditional jump depends on uninitialized valuesin S_scan_heredoc by Dave Mitchell
• [perl #129176] Conditional jump depends on uninitialized values inS_scan_heredoc by Father Chrysostomos via RT
• Re: [perl #129176] Conditional jump depends on uninitialized valuesin S_scan_heredoc by Dave Mitchell
• Re: [perl #129176] Conditional jump depends on uninitialized valuesin S_scan_heredoc by Dave Mitchell
• [perl #129176] Conditional jump depends on uninitialized values inS_scan_heredoc by Dan Collins
• Re: [perl #129176] Conditional jump depends on uninitialized valuesin S_scan_heredoc by Brian 'geeknik' Carpenter