[PATCH v6 11/19] powerpc/mm/hash: Check for non-kernel address in get_kernel_vsid()
From: Michael Ellerman <mpe@ellerman.id.au>
Date: 2017-03-30 12:04:27
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Michael Ellerman, Linus Torvalds
get_kernel_vsid() has a very stern comment saying that it's only valid for kernel addresses, but there's nothing in the code to enforce that. Rather than hoping our callers are well behaved, add a check and return a VSID of 0 (invalid). Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> --- arch/powerpc/include/asm/book3s/64/mmu-hash.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/include/asm/book3s/64/mmu-hash.h b/arch/powerpc/include/asm/book3s/64/mmu-hash.h
index a5ab6f5b8a7f..10a34282829e 100644
--- a/arch/powerpc/include/asm/book3s/64/mmu-hash.h
+++ b/arch/powerpc/include/asm/book3s/64/mmu-hash.h@@ -682,6 +682,9 @@ static inline unsigned long get_kernel_vsid(unsigned long ea, int ssize) { unsigned long context; + if (!is_kernel_addr(ea)) + return 0; + /* * For kernel space, we use context ids 1-4 to map the address space as * below:
--
2.7.4