The inline function mfn_to_pfn_no_overrides() uses __get_user() to
access the machine_to_phys_mapping array to avoid crashes when
using out of bounds indices e.g. for I/O addresses.
Avoid sparse warnings by attributing the accessed address with __user.
Signed-off-by: Juergen Gross <jgr...@suse.com>
---
arch/x86/include/asm/xen/page.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index f5d5de4..6deff84 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -113,6 +113,7 @@ static inline unsigned long
mfn_to_pfn_no_overrides(unsigned long mfn)
{
unsigned long pfn;
int ret;
+ unsigned long __user *addr;
if (xen_feature(XENFEAT_auto_translated_physmap))
return mfn;
@@ -125,7 +126,8 @@ static inline unsigned long
mfn_to_pfn_no_overrides(unsigned long mfn)
* In such cases it doesn't matter what we return (we return garbage),
* but we must handle the fault without crashing!
*/
- ret = __get_user(pfn, &machine_to_phys_mapping[mfn]);
+ addr = (unsigned long __user *)(&machine_to_phys_mapping[mfn]);
+ ret = __get_user(pfn, addr);
if (ret < 0)
return ~0;
--
2.1.2
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