linux-kernel - [PATCH] MIPS: generic/yamon-dt: fix uninitialized variable error

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Message-Id: <20211110232538.1372250-1-colin.i.king@gmail.com>
Date:   Wed, 10 Nov 2021 23:25:38 +0000
From:   Colin Ian King <colin.i.king@...glemail.com>
To:     Paul Burton <paulburton@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Ralf Baechle <ralf@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>, linux-mips@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] MIPS: generic/yamon-dt: fix uninitialized variable error

From: Colin Ian King <colin.king@...onical.com>

In the case where fw_getenv returns an error when fetching values
for ememsizea and memsize then variable phys_memsize is not assigned
a variable and will be uninitialized on a zero check of phys_memsize.
Fix this by initializing phys_memsize to zero.

Cleans up cppcheck error:
arch/mips/generic/yamon-dt.c:100:7: error: Uninitialized variable: phys_memsize [uninitvar]

Fixes: f41d2430bbd6 ("MIPS: generic/yamon-dt: Support > 256MB of RAM")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 arch/mips/generic/yamon-dt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/mips/generic/yamon-dt.c b/arch/mips/generic/yamon-dt.c
index a3aa22c77cad..a07a5edbcda7 100644
--- a/arch/mips/generic/yamon-dt.c
+++ b/arch/mips/generic/yamon-dt.c
@@ -75,7 +75,7 @@ static unsigned int __init gen_fdt_mem_array(
 __init int yamon_dt_append_memory(void *fdt,
 				  const struct yamon_mem_region *regions)
 {
-	unsigned long phys_memsize, memsize;
+	unsigned long phys_memsize = 0, memsize;
 	__be32 mem_array[2 * MAX_MEM_ARRAY_ENTRIES];
 	unsigned int mem_entries;
 	int i, err, mem_off;
-- 
2.32.0