| Message ID | 20241031173232.1776-1-grurikov@gmail.com (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: ethernet: broadcom: Fix uninitialized lockal variable | expand |
On Thu, Oct 31, 2024 at 11:02 PM George Rurikov <grurikov@gmail.com> wrote: > > 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. You mean the third parameter to the function. BTW, does this argument not hold good for local_adv also? > > Found by Linux Verification Center (linuxtesting.org) with SVACE. > > Fixes: 85730a631f0c ("tg3: Add SGMII phy support for 5719/5718 serdes") > Cc: stable@vger.kernel.org > Signed-off-by: George Rurikov <grurikov@gmail.com> > --- > 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 >
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) &&
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@vger.kernel.org Signed-off-by: George Rurikov <grurikov@gmail.com> --- drivers/net/ethernet/broadcom/tg3.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)