Patch "nios2: copy_from_user() should zero the tail of destination" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

nios2: copy_from_user() should zero the tail of destination

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
nios2-copy_from_user-should-zero-the-tail-of-destination.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Al Viro <[email protected]>
Date: Sat, 20 Aug 2016 16:36:36 -0400
Subject: nios2: copy_from_user() should zero the tail of destination

From: Al Viro <[email protected]>

commit e33d1f6f72cc82fcfc3d1fb20c9e3ad83b1928fa upstream.

---
 arch/nios2/include/asm/uaccess.h |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

@@ -102,9 +102,12 @@ extern long __copy_to_user(void __user *
 static inline long copy_from_user(void *to, const void __user *from,
 				unsigned long n)
 {
-	if (!access_ok(VERIFY_READ, from, n))
-		return n;
-	return __copy_from_user(to, from, n);
+	unsigned long res = n;
+	if (access_ok(VERIFY_READ, from, n))
+		res = __copy_from_user(to, from, n);
+	if (unlikely(res))
+		memset(to + (n - res), 0, res);
+	return res;
 }
 
 static inline long copy_to_user(void __user *to, const void *from,

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/nios2-copy_from_user-should-zero-the-tail-of-destination.patch queue-4.4/m32r-fix-__get_user.patch queue-4.4/microblaze-fix-copy_from_user.patch queue-4.4/cris-buggered-copy_from_user-copy_to_user-clear_user.patch queue-4.4/asm-generic-make-copy_from_user-zero-the-destination-properly.patch queue-4.4/metag-copy_from_user-should-zero-the-destination-on-access_ok-failure.patch queue-4.4/score-fix-__get_user-get_user.patch queue-4.4/parisc-fix-copy_from_user.patch queue-4.4/mips-copy_from_user-must-zero-the-destination-on-access_ok-failure.patch queue-4.4/alpha-fix-copy_from_user.patch queue-4.4/mn10300-failing-__get_user-and-get_user-should-zero.patch queue-4.4/openrisc-fix-copy_from_user.patch queue-4.4/avr32-fix-copy_from_user.patch queue-4.4/score-fix-copy_from_user-and-friends.patch queue-4.4/sh64-failing-__get_user-should-zero.patch queue-4.4/arc-uaccess-get_user-to-zero-out-dest-in-cause-of-fault.patch queue-4.4/hexagon-fix-strncpy_from_user-error-return.patch queue-4.4/frv-fix-clear_user.patch queue-4.4/fix-minor-infoleak-in-get_user_ex.patch queue-4.4/asm-generic-make-get_user-clear-the-destination-on-errors.patch queue-4.4/mn10300-copy_from_user-should-zero-on-access_ok-failure.patch queue-4.4/s390-get_user-should-zero-on-failure.patch queue-4.4/microblaze-fix-__get_user.patch queue-4.4/blackfin-fix-copy_from_user.patch queue-4.4/fix-iov_iter_fault_in_readable.patch queue-4.4/nios2-fix-__get_user.patch queue-4.4/sh-fix-copy_from_user.patch