[PD-dev] [ pure-data-Patches-3307503 ] segfault in DSP-loop detection
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Thu Oct 4 11:14:50 CEST 2012
Patches item #3307503, was opened at 2011-05-25 06:32
Message generated for change (Settings changed) made by zmoelnig
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Category: puredata
Group: None
>Status: Closed
Resolution: Accepted
Priority: 8
Private: No
Submitted By: IOhannes m zmölnig (zmoelnig)
Assigned to: Miller Puckette (millerpuckette)
Summary: segfault in DSP-loop detection
Initial Comment:
given a patch that contains a DSP-loop _and_ an [inlet~] _and_ and [outlet~] (see attached patch).
if this file is opened as a toplevel patch (via File->Open) and you then turn on DSP, Pd will segfault.
if [outlet~] is missing, Pd will give an error about "DSP-loop detected" and refuses to calculate (which is ok and expected).
however, a segfault is not ok.
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Comment By: Miller Puckette (millerpuckette)
Date: 2011-07-30 12:50
Message:
applied
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Comment By: IOhannes m zmölnig (zmoelnig)
Date: 2011-05-25 06:36
Message:
hunting down the bug i found that it crashes in the "fill borrowed outputs"
loop around d_ugen.c:1064.
the crash happens because dc_iosigs==NULL (due to the patch being run as
toplevel ) and dc_noutlets==dc_ninlets==1 (because there is inlet~ and
outlet~).
this combination leads to an access of (*dc_iosigs)->s_borrowedFrom which
is invalid (dc_iosigs==NULL)
the attached patch tries to fix the underlying problem, by forcing
dc_noutlets=dc_ninlets=0 if the toplevel flag is set.
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