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sh: fix copy_from_user()

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Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-08-21 23:39:47 -04:00
parent c685238922
commit 6e050503a1
1 changed files with 4 additions and 1 deletions
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5
arch/sh/include/asm/uaccess.h
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@ -151,7 +151,10 @@ copy_from_user(void *to, const void __user *from, unsigned long n)
__kernel_size_t __copy_size = (__kernel_size_t) n;
if (__copy_size && __access_ok(__copy_from, __copy_size))
return __copy_user(to, from, __copy_size);
__copy_size = __copy_user(to, from, __copy_size);
if (unlikely(__copy_size))
memset(to + (n - __copy_size), 0, __copy_size);
return __copy_size;
}