diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2016-08-17 16:02:32 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-09-09 19:34:32 -0400 |
commit | 2561d309dfd1555e781484af757ed0115035ddb3 (patch) | |
tree | 6d96d75a4e35e2280edc0e47af670a31b0da4660 | |
parent | 694d0d0bb2030d2e36df73e2d23d5770511dbc8d (diff) | |
download | linux-2561d309dfd1555e781484af757ed0115035ddb3.tar.bz2 |
alpha: fix copy_from_user()
it should clear the destination even when access_ok() fails.
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r-- | arch/alpha/include/asm/uaccess.h | 19 |
1 files changed, 8 insertions, 11 deletions
diff --git a/arch/alpha/include/asm/uaccess.h b/arch/alpha/include/asm/uaccess.h index c419b43c461d..466e42e96bfa 100644 --- a/arch/alpha/include/asm/uaccess.h +++ b/arch/alpha/include/asm/uaccess.h @@ -371,14 +371,6 @@ __copy_tofrom_user_nocheck(void *to, const void *from, long len) return __cu_len; } -extern inline long -__copy_tofrom_user(void *to, const void *from, long len, const void __user *validate) -{ - if (__access_ok((unsigned long)validate, len, get_fs())) - len = __copy_tofrom_user_nocheck(to, from, len); - return len; -} - #define __copy_to_user(to, from, n) \ ({ \ __chk_user_ptr(to); \ @@ -393,17 +385,22 @@ __copy_tofrom_user(void *to, const void *from, long len, const void __user *vali #define __copy_to_user_inatomic __copy_to_user #define __copy_from_user_inatomic __copy_from_user - extern inline long copy_to_user(void __user *to, const void *from, long n) { - return __copy_tofrom_user((__force void *)to, from, n, to); + if (likely(__access_ok((unsigned long)to, n, get_fs()))) + n = __copy_tofrom_user_nocheck((__force void *)to, from, n); + return n; } extern inline long copy_from_user(void *to, const void __user *from, long n) { - return __copy_tofrom_user(to, (__force void *)from, n, from); + if (likely(__access_ok((unsigned long)from, n, get_fs()))) + n = __copy_tofrom_user_nocheck(to, (__force void *)from, n); + else + memset(to, 0, n); + return n; } extern void __do_clear_user(void); |