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powerpc/inst: Fix sparse detection on get_user_instr()

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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.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/0320e5b41a794fd456ab8c5993bbfadcf9e1d8b4.1621516826.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-05-20 13:50:38 +00:00 committed by Michael Ellerman
parent f30becb5e9
commit b3a9e52323
1 changed files with 6 additions and 1 deletions
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7
arch/powerpc/include/asm/inst.h
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@ -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) \