[PATCH] net: ethernet: broadcom: Fix uninitialized lockal variable

[George Rurikov]

I can't find any reason why it won't happen.
In SERDES_TG3_SGMII_MODE, when current_link_up == true and
current_duplex == DUPLEX_FULL, program execution will be transferred
using the goto fiber_setup_done, where the uninitialized remote_adv
variable is passed as the second parameter to the
tg3_setup_flow_control function.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 85730a631f0c ("tg3: Add SGMII phy support for 5719/5718 serdes")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: George Rurikov <grurikov@xxxxxxxxx>
---
 drivers/net/ethernet/broadcom/tg3.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index 378815917741..b1c60851c841 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -5802,7 +5802,8 @@ static int tg3_setup_fiber_mii_phy(struct tg3 *tp, bool force_reset)
 	u32 current_speed = SPEED_UNKNOWN;
 	u8 current_duplex = DUPLEX_UNKNOWN;
 	bool current_link_up = false;
-	u32 local_adv, remote_adv, sgsr;
+	u32 local_adv, sgsr;
+	u32 remote_adv = 0;
 
 	if ((tg3_asic_rev(tp) == ASIC_REV_5719 ||
 	     tg3_asic_rev(tp) == ASIC_REV_5720) &&
-- 
2.34.1