Patch "bna: integer overflow bug in debugfs" has been added to the 4.9-stable tree

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

bna: integer overflow bug in debugfs

to the 4.9-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:
bna-integer-overflow-bug-in-debugfs.patch
and it can be found in the queue-4.9 subdirectory.

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

From: Dan Carpenter <[email protected]>
Date: Fri, 17 Mar 2017 23:52:35 +0300
Subject: bna: integer overflow bug in debugfs

From: Dan Carpenter <[email protected]>

[ Upstream commit 13e2d5187f6b965ba3556caedb914baf81b98ed2 ]

We could allocate less memory than intended because we do:

	bnad->regdata = kzalloc(len << 2, GFP_KERNEL);

The shift can overflow leading to a crash. This is debugfs code so the impact is very small.

---
 drivers/net/ethernet/brocade/bna/bnad_debugfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -325,7 +325,7 @@ bnad_debugfs_write_regrd(struct file *fi
 		return PTR_ERR(kern_buf);
 
 	rc = sscanf(kern_buf, "%x:%x", &addr, &len);
-	if (rc < 2) {
+	if (rc < 2 || len > UINT_MAX >> 2) {
 		netdev_warn(bnad->netdev, "failed to read user buffer\n");
 		kfree(kern_buf);
 		return -EINVAL;

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

queue-4.9/bna-integer-overflow-bug-in-debugfs.patch queue-4.9/btrfs-fix-an-integer-overflow-check.patch queue-4.9/ib-rxe-double-free-on-error.patch