On Fri, Jun 19, 2020 at 8:30 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > Using uninitialized_var() is dangerous as it papers over real bugs[1] > (or can in the future), and suppresses unrelated compiler warnings (e.g. > "unused variable"). If the compiler thinks it is uninitialized, either > simply initialize the variable or make compiler changes. As a precursor > to removing[2] this[3] macro[4], just initialize this variable to NULL. > No later NULL deref is possible due to the early returns outside of the > (phy->rev >= 7 && phy->rev < 19) case, which explicitly tests for NULL. > > [1] https://lore.kernel.org/lkml/20200603174714.192027-1-glider@xxxxxxxxxx/ > [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@xxxxxxxxxxxxxx/ > [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@xxxxxxxxxxxxxx/ > [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@xxxxxxxxxxxxxx/ > > Fixes: 58619b14d106 ("b43: move under broadcom vendor directory") > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> I see three total uses of uninitialized_var() in this file, do we want to eliminate all of them? > --- > drivers/net/wireless/broadcom/b43/phy_n.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/net/wireless/broadcom/b43/phy_n.c b/drivers/net/wireless/broadcom/b43/phy_n.c > index c33b4235839d..46db91846007 100644 > --- a/drivers/net/wireless/broadcom/b43/phy_n.c > +++ b/drivers/net/wireless/broadcom/b43/phy_n.c > @@ -4222,7 +4222,7 @@ static void b43_nphy_tx_gain_table_upload(struct b43_wldev *dev) > u32 rfpwr_offset; > u8 pga_gain, pad_gain; > int i; > - const s16 *uninitialized_var(rf_pwr_offset_table); > + const s16 *rf_pwr_offset_table = NULL; > > table = b43_nphy_get_tx_gain_table(dev); > if (!table) > -- -- Thanks, ~Nick Desaulniers
