igb: Initialize mailbox message for VF reset

commit de5dc44370fbd6b46bd7f1a1e00369be54a041c8 upstream.

When a MAC address is not assigned to the VF, that portion of the message
sent to the VF is not set. The memory, however, is allocated from the
stack meaning that information may be leaked to the VM. Initialize the
message buffer to 0 so that no information is passed to the VM in this
case.

Fixes: 6ddbc4cf1f4d ("igb: Indicate failure on vf reset for empty mac address")
Reported-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20221212190031.3983342-1-anthony.l.nguyen@intel.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 82f1960c6c19ad507dfd4472946bb72e3e67f3d6..2c1e3ea8f7450a27fb6f4cbb714b485aae2778ab 100644 (file)
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -6422,7 +6422,7 @@ static void igb_vf_reset_msg(struct igb_adapter *adapter, u32 vf)
 {
        struct e1000_hw *hw = &adapter->hw;
        unsigned char *vf_mac = adapter->vf_data[vf].vf_mac_addresses;
-       u32 reg, msgbuf[3];
+       u32 reg, msgbuf[3] = {};
        u8 *addr = (u8 *)(&msgbuf[1]);
 
        /* process all the same items cleared in a function level reset */