[PATCH AUTOSEL 4.20 14/52] ARM: OMAP2+: Variable "reg" in function omap4_dsi_mux_pads() could be uninitialized

From: Yizhuo yzhai003@ucr.edu

[ Upstream commit dc30e70391376ba3987aeb856ae6d9c0706534f1 ]

In function omap4_dsi_mux_pads(), local variable "reg" could be uninitialized if function regmap_read() returns -EINVAL. However, it will be used directly in the later context, which is potentially unsafe.

Signed-off-by: Yizhuo yzhai003@ucr.edu Signed-off-by: Tony Lindgren tony@atomide.com Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/mach-omap2/display.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c index f86b72d1d59e..1444b4b4bd9f 100644 --- a/arch/arm/mach-omap2/display.c +++ b/arch/arm/mach-omap2/display.c @@ -83,6 +83,7 @@ static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes) u32 enable_mask, enable_shift; u32 pipd_mask, pipd_shift; u32 reg; + int ret;

if (dsi_id == 0) { enable_mask = OMAP4_DSI1_LANEENABLE_MASK; @@ -98,7 +99,11 @@ static int omap4_dsi_mux_pads(int dsi_id, unsigned lanes) return -ENODEV; }

- regmap_read(omap4_dsi_mux_syscon, OMAP4_DSIPHY_SYSCON_OFFSET, &reg); + ret = regmap_read(omap4_dsi_mux_syscon, + OMAP4_DSIPHY_SYSCON_OFFSET, + &reg); + if (ret) + return ret;

reg &= ~enable_mask; reg &= ~pipd_mask;