riscv/addrenv_shm: Add missing sanity check to up_shmdt()

A missing sanity check, make sure the last level page table actually exists before trying to clear entries from it.
2023-01-17 16:00:51 +02:00 · 2023-01-17 16:00:51 +02:00 · 58b5a0412e
commit 58b5a0412e
parent fa6ba05097
1 changed files with 4 additions and 0 deletions
--- a/arch/risc-v/src/common/riscv_addrenv_shm.c
+++ b/arch/risc-v/src/common/riscv_addrenv_shm.c
@ -159,6 +159,10 @@ int up_shmdt(uintptr_t vaddr, unsigned int npages)

      paddr = mmu_pte_to_paddr(mmu_ln_getentry(ptlevel, ptprev, vaddr));
      ptlast = riscv_pgvaddr(paddr);
+      if (!ptlast)
+        {
+          return -EFAULT;
+        }

      /* Then wipe the reference */