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i40evf: don't overflow buffer

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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 <mitch.a.williams@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams
2016-05-16 10:26:36 -07:00
committed by Jeff Kirsher
parent f980d445e5
commit 0e8d95f896
1 changed files with 8 additions and 0 deletions
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8
drivers/net/ethernet/intel/i40evf/i40evf_virtchnl.c
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@@ -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)