netdev - [PATCH net-next] ixgb: relax stack usage of 768 Byte

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 16 Sep 2011 23:34:57 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	netdev@...r.kernel.org
Cc:	Hagen Paul Pfeifer <hagen@...u.net>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [PATCH net-next] ixgb: relax stack usage of 768 Byte

ixgb_set_multi() will push (128 * 6) byte on the stack to set the
multicast filter. Fix this by allocate the scratch buffer on the heap.

Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net>
Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/ixgb/ixgb_main.c |    8 ++++++--
 1 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/ixgb/ixgb_main.c b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
index c8b9c90..4d23007 100644
--- a/drivers/net/ethernet/intel/ixgb/ixgb_main.c
+++ b/drivers/net/ethernet/intel/ixgb/ixgb_main.c
@@ -1095,8 +1095,10 @@ ixgb_set_multi(struct net_device *netdev)
 		rctl |= IXGB_RCTL_MPE;
 		IXGB_WRITE_REG(hw, RCTL, rctl);
 	} else {
-		u8 mta[IXGB_MAX_NUM_MULTICAST_ADDRESSES *
-			    IXGB_ETH_LENGTH_OF_ADDRESS];
+		u8 *mta = kmalloc(IXGB_MAX_NUM_MULTICAST_ADDRESSES *
+				IXGB_ETH_LENGTH_OF_ADDRESS, GFP_ATOMIC);
+		if (!mta)
+			return;
 
 		IXGB_WRITE_REG(hw, RCTL, rctl);
 
@@ -1106,6 +1108,8 @@ ixgb_set_multi(struct net_device *netdev)
 			       ha->addr, IXGB_ETH_LENGTH_OF_ADDRESS);
 
 		ixgb_mc_addr_list_update(hw, mta, netdev_mc_count(netdev), 0);
+
+		kfree(mta);
 	}
 
 	if (netdev->features & NETIF_F_HW_VLAN_RX)
-- 
1.7.5.4

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html