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Subject[PATCH 3.16 076/178] bna: integer overflow bug in debugfs
3.16.46-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@oracle.com>

commit 13e2d5187f6b965ba3556caedb914baf81b98ed2 upstream.

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@oracle.com>
Acked-by: Rasesh Mody <rasesh.mody@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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
@@ -331,7 +331,7 @@ bnad_debugfs_write_regrd(struct file *fi
}

rc = sscanf(kern_buf, "%x:%x", &addr, &len);
- if (rc < 2) {
+ if (rc < 2 || len > UINT_MAX >> 2) {
pr_warn("bna %s: Failed to read user buffer\n",
pci_name(bnad->pcidev));
kfree(kern_buf);
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