From 0e8d95f8965dc2e6f22e5b321b73de7b0396dc4a Mon Sep 17 00:00:00 2001 From: Mitch Williams Date: Mon, 16 May 2016 10:26:36 -0700 Subject: [PATCH] i40evf: don't overflow buffer If the user adds an obscene amount of MAC addresses, the driver will run into the situation where it has too many address requests to fit into a single PF message. The driver checks for this case, and calculates the maximum number of messages that it can send. Then it completely ignores this count and overflows the buffer. Fix this by checking the address count and bailing out of the loop at the appropriate time. Change-ID: If8dcbb04602c75941dc0cd8309065e1de9ca791c Signed-off-by: Mitch Williams Tested-by: Andrew Bowers Signed-off-by: Jeff Kirsher --- drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c index f13445691507..d76c221d4c8a 100644 --- a/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c +++ b/drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c @@ -434,6 +434,8 @@ void i40evf_add_ether_addrs(struct i40evf_adapter *adapter) ether_addr_copy(veal->list[i].addr, f->macaddr); i++; f->add = false; + if (i == count) + break; } } if (!more) @@ -497,6 +499,8 @@ void i40evf_del_ether_addrs(struct i40evf_adapter *adapter) i++; list_del(&f->list); kfree(f); + if (i == count) + break; } } if (!more) @@ -560,6 +564,8 @@ void i40evf_add_vlans(struct i40evf_adapter *adapter) vvfl->vlan_id[i] = f->vlan; i++; f->add = false; + if (i == count) + break; } } if (!more) @@ -623,6 +629,8 @@ void i40evf_del_vlans(struct i40evf_adapter *adapter) i++; list_del(&f->list); kfree(f); + if (i == count) + break; } } if (!more) -- 2.20.1