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riscv: Fix spurious errors from __get/put_kernel_nofault

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commit d080a08b06b6266cc3e0e86c5acfd80db937cb6b upstream.

These macros did not initialize __kr_err, so they could fail even if
the access did not fault.

Cc: stable@vger.kernel.org
Fixes: d464118cdc41 ("riscv: implement __get_kernel_nofault and __put_user_nofault")
Signed-off-by: Samuel Holland <samuel.holland@sifive.com>
Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240312022030.320789-1-samuel.holland@sifive.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Holland 2024-03-11 19:19:13 -07:00 • committed by Ksawlii
parent e32689907e
commit 828f658b28
1 changed files with 2 additions and 2 deletions
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4
arch/riscv/include/asm/uaccess.h
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@ -468,7 +468,7 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n)
#define __get_kernel_nofault(dst, src, type, err_label) \ #define __get_kernel_nofault(dst, src, type, err_label) \
do { \ do { \
long __kr_err; \ long __kr_err = 0; \
\ \
__get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \ __get_user_nocheck(*((type *)(dst)), (type *)(src), __kr_err); \
if (unlikely(__kr_err)) \ if (unlikely(__kr_err)) \
@ -477,7 +477,7 @@ do { \
#define __put_kernel_nofault(dst, src, type, err_label) \ #define __put_kernel_nofault(dst, src, type, err_label) \
do { \ do { \
long __kr_err; \ long __kr_err = 0; \
\ \
__put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \ __put_user_nocheck(*((type *)(src)), (type *)(dst), __kr_err); \
if (unlikely(__kr_err)) \ if (unlikely(__kr_err)) \