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 <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Dec 21 09:02:40 CET 2017
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Fri, 17 Mar 2017 23:52:35 +0300
Subject: bna: integer overflow bug in debugfs
From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
[ 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.
Fixes: 7afc5dbde091 ("bna: Add debugfs interface.")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Acked-by: Rasesh Mody <rasesh.mody@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/brocade/bna/bnad_debugfs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
+++ b/drivers/net/ethernet/brocade/bna/bnad_debugfs.c
@@ -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 dan.carpenter@xxxxxxxxxx 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