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[PATCH] powerpc: IOMMU: don't ioremap null addresses 

240-ioremap-null-ptr-test.patch

Under highly unusual circumstances, a buggy driver will ask a null ptr
to be ioremapped, an operation that curently succeeds but leads to
later trouble.  Instead, refuse to remap the null pointer.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
(cherry picked from e71d9e598533c1889e7162f5f4647e5d378c102c commit)
This commit is contained in:
Linas Vepstas 2005-11-03 18:55:14 -06:00 committed by Paul Mackerras
parent 3914ac7b0e
commit d177c207ba
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/mm/pgtable_64.c
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@ -174,7 +174,7 @@ void __iomem * __ioremap(unsigned long addr, unsigned long size,
pa = addr & PAGE_MASK;
size = PAGE_ALIGN(addr + size) - pa;
if (size == 0)
if ((size == 0) || (pa == 0))
return NULL;
if (mem_init_done) {