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Fix undefined behavior in mapbacktrace

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* src/eval.c (Fmapbacktrace): Don't assume that PDL is still valid.
This commit is contained in:
Philipp Stephani 2017-06-05 22:09:00 +02:00
parent 9ae5c0a2e1
commit 3d9d976aa4
1 changed files with 5 additions and 1 deletions
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6
src/eval.c
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@ -3613,8 +3613,12 @@ returns nil. */)
while (backtrace_p (pdl))
{
ptrdiff_t i = pdl - specpdl;
backtrace_frame_apply (function, pdl);
pdl = backtrace_next (pdl);
/* Beware! PDL is no longer valid here because FUNCTION might
have caused grow_specpdl to reallocate pdlvec. We must use
the saved index, cf. Bug#27258. */
pdl = backtrace_next (&specpdl[i]);
}
return Qnil;