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properly check for return value of mem_sbrk

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Godmar Back 2022-10-28 13:46:39 -04:00
parent e4275ea995
commit cedb5d607c
1 changed files with 2 additions and 2 deletions
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4
mm-gback-implicit.c
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@ -145,7 +145,7 @@ int mm_init(void)
/* Create the initial empty heap */ /* Create the initial empty heap */
struct boundary_tag * initial = mem_sbrk(4 * sizeof(struct boundary_tag)); struct boundary_tag * initial = mem_sbrk(4 * sizeof(struct boundary_tag));
if (initial == (void *)-1) if (initial == NULL)
return -1; return -1;
/* We use a slightly different strategy than suggested in the book. /* We use a slightly different strategy than suggested in the book.
@ -302,7 +302,7 @@ static struct block *extend_heap(size_t words)
{ {
void *bp = mem_sbrk(words * WSIZE); void *bp = mem_sbrk(words * WSIZE);
if ((intptr_t) bp == -1) if (bp == NULL)
return NULL; return NULL;
/* Initialize free block header/footer and the epilogue header. /* Initialize free block header/footer and the epilogue header.