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


bug #45714: read access violation in MWrapChar()

Submitted by:  Kuang-che Wu <kcwu>
Submitted on:  Fri 07 Aug 2015 02:07:13 PM UTC  
Category: Crash/Freeze/InfloopSeverity: 3 - Normal
Priority: 5 - NormalStatus: None
Privacy: PublicAssigned to: None
Open/Closed: OpenRelease: None
Fixed Release: NonePlanned 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>


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