linux-kernel - [PATCH] staging: sm750fb: Potential uninitialized field in "pll"

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Date:   Wed,  9 Oct 2019 21:38:08 -0700
From:   Yizhuo <yzhai003@....edu>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Yizhuo <yzhai003@....edu>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Teddy Wang <teddy.wang@...iconmotion.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-fbdev@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] staging: sm750fb: Potential uninitialized field in "pll"

Inside function set_chip_clock(), struct pll is supposed to be
initialized in sm750_calc_pll_value(), if condition
"diff < mini_diff" in sm750_calc_pll_value() cannot be fulfilled,
then some field of pll will not be initialized but used in
function sm750_format_pll_reg(), which is potentially unsafe.

Signed-off-by: Yizhuo <yzhai003@....edu>
---
 drivers/staging/sm750fb/ddk750_chip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/sm750fb/ddk750_chip.c b/drivers/staging/sm750fb/ddk750_chip.c
index 5a317cc98a4b..31b3cf9c2d8b 100644
--- a/drivers/staging/sm750fb/ddk750_chip.c
+++ b/drivers/staging/sm750fb/ddk750_chip.c
@@ -55,7 +55,7 @@ static unsigned int get_mxclk_freq(void)
  */
 static void set_chip_clock(unsigned int frequency)
 {
-	struct pll_value pll;
+	struct pll_value pll = {};
 	unsigned int actual_mx_clk;
 
 	/* Cheok_0509: For SM750LE, the chip clock is fixed. Nothing to set. */
-- 
2.17.1