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i40evf: ethtool RSS fixes

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Add an extra check to make sure that the indirection table pointer is
valid before dereferencing it.

Change-ID: I698adbf3daff03081d01f489dc95a9f1ad8b12f1
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Mitch Williams <mitch.a.williams@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mitch Williams 2015-02-24 06:58:51 +00:00 committed by Jeff Kirsher
parent 66ddcffb1a
commit ed250ecc55
1 changed files with 8 additions and 6 deletions
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14
drivers/net/ethernet/intel/i40evf/i40evf_ethtool.c
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@ -642,12 +642,14 @@ static int i40evf_get_rxfh(struct net_device *netdev, u32 *indir, u8 *key,
if (!indir)
return 0;
for (i = 0, j = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) {
hlut_val = rd32(hw, I40E_VFQF_HLUT(i));
indir[j++] = hlut_val & 0xff;
indir[j++] = (hlut_val >> 8) & 0xff;
indir[j++] = (hlut_val >> 16) & 0xff;
indir[j++] = (hlut_val >> 24) & 0xff;
if (indir) {
for (i = 0, j = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) {
hlut_val = rd32(hw, I40E_VFQF_HLUT(i));
indir[j++] = hlut_val & 0xff;
indir[j++] = (hlut_val >> 8) & 0xff;
indir[j++] = (hlut_val >> 16) & 0xff;
indir[j++] = (hlut_val >> 24) & 0xff;
}
}
return 0;
}