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2000-11-28 Chris Johns <ccj@acm.org>

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* src/heapallocate.c: Do not allow the size to overflow when
	adjusting it.  A test allocated a stack of -1 (~0). This
	actually resulted in a stack being allocated but with a
	size of 0xb. The allocator did not test the size to see if
	it rolled through 0 and so allowed the allocation to happen, the
	thread to get created. The task crashed as you would expect.
This commit is contained in:
Joel Sherrill
2000-11-28 21:47:27 +00:00
parent e5aeae7b30
commit 99cfdc2dea
1 changed files with 9 additions and 1 deletions
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10
c/src/exec/score/src/heapallocate.c
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@@ -43,7 +43,15 @@ void *_Heap_Allocate(
Heap_Block *temporary_block;
void *ptr;
unsigned32 offset;
/*
* Catch the case of a user allocating close to the limit of the
* unsigned32.
*/
if ( size >= (-1 - HEAP_BLOCK_USED_OVERHEAD) )
return( NULL );
excess = size % the_heap->page_size;
the_size = size + the_heap->page_size + HEAP_BLOCK_USED_OVERHEAD;