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Date:	Tue, 21 Jan 2014 00:15:32 +0000
From:	"Brown, Aaron F" <>
To:	"" <>
CC:	"" <>
Subject: [net-next] [patch v2] i40e: potential array underflow in

I did not see this on the netdev list so forwarding from e1000-devel
with subject line changed, a Tested-by: and Signed-off-by added.

From: Dan Carpenter <>
Reply-to: Dan Carpenter <>
To: Jeff Kirsher <>
Bruce Allan <>, Jesse Brandeburg
<>, Wei Yongjun
<>, John Ronciak <>
Subject: [E1000-devel] [patch v2] i40e: potential array underflow in
Date: Sat, 11 Jan 2014 12:58:42 +0300

If "vf_id" is smaller than hw->func_caps.vf_base_id then it leads to
an array underflow of the pf->vf[] array.  This is unlikely to happen
unless the hardware is bad, but it's a small change and it silences a
static checker warning.

Fixes: 7efa84b7abc1 ('i40e: support VFs on PFs other than 0')
Signed-off-by: Dan Carpenter <>
Tested-by: Sibai Li <>
Signed-off-by: Aaron Brown <>
v2: rebased.  commit message updated.

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 51a4f6125437..b77d7e79d977 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -1772,7 +1772,7 @@ int i40e_vc_process_vf_msg(struct i40e_pf *pf, u16 vf_id, u32 v_opcode,
 			   u32 v_retval, u8 *msg, u16 msglen)
 	struct i40e_hw *hw = &pf->hw;
-	int local_vf_id = vf_id - hw->func_caps.vf_base_id;
+	unsigned int local_vf_id = vf_id - hw->func_caps.vf_base_id;
 	struct i40e_vf *vf;
 	int ret;

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