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authorAl Viro <viro@zeniv.linux.org.uk>2016-09-09 19:22:34 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2016-09-13 17:50:17 -0400
commitd0cf385160c12abd109746cad1f13e3b3e8b50b8 (patch)
treeed39b065cc89614269e0265db0643a7b3802812e /arch/microblaze
parentc90a3bc5061d57e7931a9b7ad14784e1a0ed497d (diff)
downloadblackbird-op-linux-d0cf385160c12abd109746cad1f13e3b3e8b50b8.tar.gz
blackbird-op-linux-d0cf385160c12abd109746cad1f13e3b3e8b50b8.zip
microblaze: fix copy_from_user()
Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/include/asm/uaccess.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/microblaze/include/asm/uaccess.h b/arch/microblaze/include/asm/uaccess.h
index 331b0d35f89c..3a486d3b6f52 100644
--- a/arch/microblaze/include/asm/uaccess.h
+++ b/arch/microblaze/include/asm/uaccess.h
@@ -373,10 +373,13 @@ extern long __user_bad(void);
static inline long copy_from_user(void *to,
const void __user *from, unsigned long n)
{
+ unsigned long res = n;
might_fault();
- if (access_ok(VERIFY_READ, from, n))
- return __copy_from_user(to, from, n);
- return n;
+ if (likely(access_ok(VERIFY_READ, from, n)))
+ res = __copy_from_user(to, from, n);
+ if (unlikely(res))
+ memset(to + (n - res), 0, res);
+ return res;
}
#define __copy_to_user(to, from, n) \
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