bugGNU Screen - Bugs: bug #45714, read access violation in...

 
 

bug #45714: read access violation in MWrapChar()

Submitter:  Kuang-che Wu <kcwu>
Submitted:  Fri 07 Aug 2015 02:07:13 PM UTC
   
 
Category:  Crash/Freeze/Infloop Severity:  3 - Normal
Priority:  * 5 - Normal Status:  None
Privacy:  Public Assigned to:  None
Open/Closed:  Open Release:  None
Fixed Release:  None Planned Release:  None
Work Required:  None
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Fri 07 Aug 2015 02:10:47 PM UTC, comment #1: 

ah, sorry, the reproduce step and the description mismatch.

the reproduce step should be
$ screen -D -m printf '\x1b[?3h0'

this issue is detected by afl-fuzz

Kuang-che Wu <kcwu>
Fri 07 Aug 2015 02:07:13 PM UTC, original submission:  

How to reproduce
$ screen -D -m printf '\x1b[8;;1t\xe3\x80\xb4\x1b[P'

It crashed inside MWrapChar() with y=-1
at line
  copy_mchar2mline(&mchar_null, ml, p->w_width);
which access to ml->image but ml is invalid due to
  ml = &p->w_mlines[y];

Kuang-che Wu <kcwu>

 

(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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