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fix a potential memory leak

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This commit is contained in:
Robert Morris 2019-10-27 13:36:46 -04:00
parent d9160fb4b9
commit e7ffb74ad1
2 changed files with 3 additions and 3 deletions
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3
kernel/proc.c
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@ -176,8 +176,7 @@ proc_freepagetable(pagetable_t pagetable, uint64 sz)
{ {
uvmunmap(pagetable, TRAMPOLINE, PGSIZE, 0); uvmunmap(pagetable, TRAMPOLINE, PGSIZE, 0);
uvmunmap(pagetable, TRAPFRAME, PGSIZE, 0); uvmunmap(pagetable, TRAPFRAME, PGSIZE, 0);
if(sz > 0) uvmfree(pagetable, sz);
uvmfree(pagetable, sz);
} }
// a user program that calls exec("/init") // a user program that calls exec("/init")

3
kernel/vm.c
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@ -301,7 +301,8 @@ freewalk(pagetable_t pagetable)
void void
uvmfree(pagetable_t pagetable, uint64 sz) uvmfree(pagetable_t pagetable, uint64 sz)
{ {
uvmunmap(pagetable, 0, sz, 1); if(sz > 0)
uvmunmap(pagetable, 0, sz, 1);
freewalk(pagetable); freewalk(pagetable);
} }