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-rw-r--r--vm.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/vm.c b/vm.c
index 95eeca8..a60c915 100644
--- a/vm.c
+++ b/vm.c
@@ -313,13 +313,17 @@ copyuvm(pde_t *pgdir, uint sz)
if(*pte & PTE_P){
pa = PTE_ADDR(*pte);
if (!(mem = kalloc()))
- return 0;
+ goto bad;
memmove(mem, (char *)pa, PGSIZE);
if (!mappages(d, (void *)i, PGSIZE, PADDR(mem), PTE_W|PTE_U))
- return 0;
+ goto bad;
}
}
return d;
+
+bad:
+ freevm(d);
+ return 0;
}
// Allocate one page table for the machine for the kernel address