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Date: Fri, 19 Jun 2020 20:29:55 -0700 From: Kees Cook <keescook@...omium.org> To: linux-kernel@...r.kernel.org Cc: Kees Cook <keescook@...omium.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Miguel Ojeda <miguel.ojeda.sandonis@...il.com>, Alexander Potapenko <glider@...gle.com>, Joe Perches <joe@...ches.com>, Andy Whitcroft <apw@...onical.com>, x86@...nel.org, drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org, b43-dev@...ts.infradead.org, netdev@...r.kernel.org, linux-doc@...r.kernel.org, linux-wireless@...r.kernel.org, linux-ide@...r.kernel.org, linux-clk@...r.kernel.org, linux-spi@...r.kernel.org, linux-mm@...ck.org, clang-built-linux@...glegroups.com Subject: [PATCH v2 04/16] b43: Remove uninitialized_var() usage 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@google.com/ [2] https://lore.kernel.org/lkml/CA+55aFw+Vbj0i=1TGqCR5vQkCzWJ0QxK6CernOU6eedsudAixw@mail.gmail.com/ [3] https://lore.kernel.org/lkml/CA+55aFwgbgqhbp1fkxvRKEpzyR5J8n1vKT1VZdz9knmPuXhOeg@mail.gmail.com/ [4] https://lore.kernel.org/lkml/CA+55aFz2500WfbKXAx8s67wrm9=yVJu65TpLgN_ybYNv0VEOKA@mail.gmail.com/ Fixes: 58619b14d106 ("b43: move under broadcom vendor directory") Signed-off-by: Kees Cook <keescook@...omium.org> --- 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) -- 2.25.1
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