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Add mallocs for read/write tables, NULL-out code

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This commit is contained in:
Peter Evans 2017-12-12 14:32:32 -06:00
parent b36bb78a12
commit 06705f21fc
1 changed files with 22 additions and 0 deletions
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22
src/vm_segment.c
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@ -38,6 +38,28 @@ vm_segment_create(size_t size)
return NULL;
}
segment->read_table = malloc(sizeof(vm_segment_read_fn) * size);
if (segment->read_table == NULL) {
log_critical("Couldn't allocate enough space for segment read_table");
return NULL;
}
segment->write_table = malloc(sizeof(vm_segment_write_fn) * size);
if (segment->write_table == NULL) {
log_critical("Couldn't allocate enough space for segment write_table");
return NULL;
}
/*
* Let's NULL-out the read and write tables. If we don't do so, they
* may have some bits of garbage in it, and could cause the
* read/write mapper code to attempt to a run a function with
* garbage. We could have undefined garbage! We can only properly
* work with defined garbage.
*/
memset(segment->read_table, (int)NULL, sizeof(vm_segment_read_fn));
memset(segment->write_table, (int)NULL, sizeof(vm_segment_write_fn));
segment->size = size;
return segment;