[PATCH for v4.9 LTS 27/86] bnxt_en: Fix "uninitialized variable" bug in TPA code path.

From: Levin, Alexander (Sasha Levin)
Date: Sat Jun 17 2017 - 18:41:16 EST

From: Michael Chan <michael.chan@xxxxxxxxxxxx>

[ Upstream commit 719ca8111402aa6157bd83a3c966d184db0d8956 ]

In the TPA GRO code path, initialize the tcp_opt_len variable to 0 so
that it will be correct for packets without TCP timestamps. The bug
caused the SKB fields to be incorrectly set up for packets without
TCP timestamps, leading to these packets being rejected by the stack.

Reported-by: Andy Gospodarek <andrew.gospodarek@xxxxxxxxxxxx>
Acked-by: Andy Gospodarek <andrew.gospodarek@xxxxxxxxxxxx>
Signed-off-by: Michael Chan <michael.chan@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 5cc0f8cfec87..20e569bd978a 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -1097,7 +1097,7 @@ static struct sk_buff *bnxt_gro_func_5730x(struct bnxt_tpa_info *tpa_info,
struct tcphdr *th;
- int len, nw_off, tcp_opt_len;
+ int len, nw_off, tcp_opt_len = 0;

if (tcp_ts)
tcp_opt_len = 12;