From: Linus Torvalds Date: Tue, 9 Jun 2020 17:39:33 +0000 (-0700) Subject: x86: use proper parentheses around new uaccess macro argument uses X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=3beff76b54986fc3132fb62614875f116bba7701;p=linux.git x86: use proper parentheses around new uaccess macro argument uses __get_kernel_nofault() didn't have the parentheses around the use of 'src' and 'dst' macro arguments, making the casts potentially do the wrong thing. The parentheses aren't necessary with the current very limited use in mm/access.c, but it's bad form, and future use-cases might have very unexpected errors as a result. Do the same for unsafe_copy_loop() while at it, although in that case it is an entirely internal x86 uaccess helper macro that isn't used anywhere else and any other use would be invalid anyway. Fixes: fa94111d9435 ("x86: use non-set_fs based maccess routines") Cc: Christoph Hellwig Cc: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h index 35b23b0311f5e..18dfa07d3ef0d 100644 --- a/arch/x86/include/asm/uaccess.h +++ b/arch/x86/include/asm/uaccess.h @@ -504,12 +504,12 @@ do { \ * We want the unsafe accessors to always be inlined and use * the error labels - thus the macro games. */ -#define unsafe_copy_loop(dst, src, len, type, label) \ - while (len >= sizeof(type)) { \ - unsafe_put_user(*(type *)src,(type __user *)dst,label); \ - dst += sizeof(type); \ - src += sizeof(type); \ - len -= sizeof(type); \ +#define unsafe_copy_loop(dst, src, len, type, label) \ + while (len >= sizeof(type)) { \ + unsafe_put_user(*(type *)(src),(type __user *)(dst),label); \ + dst += sizeof(type); \ + src += sizeof(type); \ + len -= sizeof(type); \ } #define unsafe_copy_to_user(_dst,_src,_len,label) \ @@ -529,7 +529,7 @@ do { \ do { \ int __kr_err; \ \ - __get_user_size(*((type *)dst), (__force type __user *)src, \ + __get_user_size(*((type *)(dst)), (__force type __user *)(src), \ sizeof(type), __kr_err); \ if (unlikely(__kr_err)) \ goto err_label; \