[PATCH v2 01/12] powerpc/inst: Fix sparse detection on get_user_instr()

[Christophe Leroy]

get_user_instr() lacks sparse detection for the __user tag.

This is because __gui_ptr is assigned with a cast.

Fix that by adding a __chk_user_ptr()

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 arch/powerpc/include/asm/inst.h | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/inst.h b/arch/powerpc/include/asm/inst.h
index 268d3bd073c8..887ef150fdda 100644
--- a/arch/powerpc/include/asm/inst.h
+++ b/arch/powerpc/include/asm/inst.h
@@ -12,6 +12,8 @@
        unsigned long __gui_ptr = (unsigned long)ptr;                   \
        struct ppc_inst __gui_inst;                                     \
        unsigned int __prefix, __suffix;                                \
+                                                                       \
+       __chk_user_ptr(ptr);                                            \
        __gui_ret = gu_op(__prefix, (unsigned int __user *)__gui_ptr);  \
        if (__gui_ret == 0) {                                           \
                if ((__prefix >> 26) == OP_PREFIX) {                    \
@@ -29,7 +31,10 @@
 })
 #else /* !CONFIG_PPC64 */
 #define ___get_user_instr(gu_op, dest, ptr)                            \
-       gu_op((dest).val, (u32 __user *)(ptr))
+({                                                                     \
+       __chk_user_ptr(ptr);                                            \
+       gu_op((dest).val, (u32 __user *)(ptr));                         \
+})
 #endif /* CONFIG_PPC64 */
 
 #define get_user_instr(x, ptr) \
-- 
2.25.0