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blackfin: 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 2016-09-09 19:16:58 -04:00
parent 917400cecb
commit 8f035983dd
1 changed files with 5 additions and 4 deletions
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7
arch/blackfin/include/asm/uaccess.h
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@ -171,12 +171,13 @@ static inline int bad_user_access_length(void)
static inline unsigned long __must_check static inline unsigned long __must_check
copy_from_user(void *to, const void __user *from, unsigned long n) copy_from_user(void *to, const void __user *from, unsigned long n)
{ {
if (access_ok(VERIFY_READ, from, n)) if (likely(access_ok(VERIFY_READ, from, n))) {
memcpy(to, (const void __force *)from, n); memcpy(to, (const void __force *)from, n);
else
return n;
return 0; return 0;
} }
memset(to, 0, n);
return n;
}
static inline unsigned long __must_check static inline unsigned long __must_check
copy_to_user(void __user *to, const void *from, unsigned long n) copy_to_user(void __user *to, const void *from, unsigned long n)