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ielr: fix crash on memory management

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Reported by Dwight Guth.
https://lists.gnu.org/r/bug-bison/2020-06/msg00037.html

* src/AnnotationList.c (AnnotationList__computePredecessorAnnotations):
Beware that SBITSET__FOR_EACH nests _two_ for-loops, so "break" does
not actually break out of it.
That was the only occurrence in the code.
* src/Sbitset.h (SBITSET__FOR_EACH): Warn passersby.
This commit is contained in:
Akim Demaille
2020-06-26 07:33:51 +02:00
parent 8f44164443
commit cf6d8d0631
4 changed files with 10 additions and 1 deletions
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4
NEWS
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@@ -44,6 +44,10 @@ GNU Bison NEWS
string aliases semantically equivalent but syntactically different (e.g.,
"A", "\x41", "\101") are considered to be different.
*** Crash when generating IELR
An old, well hidden, bug in the generation of IELR parsers was fixed.
** New features
*** File prefix mapping

1
THANKS
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@@ -59,6 +59,7 @@ Di-an Jan dianj@freeshell.org
Dick Streefland dick.streefland@altium.nl
Didier Godefroy dg@ulysium.net
Don Macpherson donmac703@gmail.com
Dwight Guth dwight.guth@runtimeverification.com
Efi Fogel efifogel@gmail.com
Enrico Scholz enrico.scholz@informatik.tu-chemnitz.de
Eric Blake ebb9@byu.net

4
src/AnnotationList.c
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@@ -276,7 +276,8 @@ AnnotationList__computePredecessorAnnotations (
obstack_free (annotations_obstackp,
annotation_node->contributions[ci]);
annotation_node->contributions[ci] = NULL;
break;
// "Break" out of SBITSET__FOR_EACH.
goto after_sbitset__for_each;
}
else
{
@@ -309,6 +310,7 @@ AnnotationList__computePredecessorAnnotations (
predecessor_item);
}
}
after_sbitset__for_each:;
}
if (annotation_node->contributions[ci])
{

2
src/Sbitset.h
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@@ -81,6 +81,8 @@ void Sbitset__fprint (Sbitset self, Sbitset__Index nbits, FILE *file);
*ptr_self = *ptr_other1 | *ptr_other2; \
} while (0)
/* ATTENTION: there are *two* loops here, "break" and "continue" will
not apply to the whole loop, just the inner one. */
# define SBITSET__FOR_EACH(SELF, NBITS, ITER, INDEX) \
for ((ITER) = (SELF); (ITER) < (SELF) + Sbitset__nbytes (NBITS); ++(ITER)) \
if (*(ITER) != 0) \