openwrt-archive/target/linux/brcm47xx/patches-4.1/031-01-MIPS-BCM47XX-Make-sure-NVRAM-buffer-ends-with-0.patch

From 4ddb225376a2802a4e20e16f71c6d37b679e3169 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Tue, 12 May 2015 18:46:11 +0200
Subject: [PATCH] MIPS: BCM47XX: Make sure NVRAM buffer ends with \0
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This will simplify reading its contents.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: linux-mips@linux-mips.org
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Hante Meuleman <meuleman@broadcom.com>
Cc: Ian Kent <raven@themaw.net>
Patchwork: https://patchwork.linux-mips.org/patch/10031/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
---
 arch/mips/bcm47xx/nvram.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- a/arch/mips/bcm47xx/nvram.c
+++ b/arch/mips/bcm47xx/nvram.c
@@ -98,7 +98,7 @@ found:
 		pr_err("The nvram size accoridng to the header seems to be bigger than the partition on flash\n");
 	if (header->len > NVRAM_SPACE)
 		pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
-		       header->len, NVRAM_SPACE);
+		       header->len, NVRAM_SPACE - 1);
 
 	src = (u32 *)header;
 	dst = (u32 *)nvram_buf;
@@ -106,6 +106,7 @@ found:
 		*dst++ = __raw_readl(src++);
 	for (; i < header->len && i < NVRAM_SPACE && i < size; i += 4)
 		*dst++ = readl(src++);
+	nvram_buf[NVRAM_SPACE - 1] = '\0';
 
 	return 0;
 }
@@ -150,10 +151,10 @@ static int nvram_init(void)
 		u8 *dst = (uint8_t *)nvram_buf;
 		size_t len = header.len;
 
-		if (header.len > NVRAM_SPACE) {
+		if (len >= NVRAM_SPACE) {
+			len = NVRAM_SPACE - 1;
 			pr_err("nvram on flash (%i bytes) is bigger than the reserved space in memory, will just copy the first %i bytes\n",
-				header.len, NVRAM_SPACE);
-			len = NVRAM_SPACE;
+				header.len, len);
 		}
 
 		err = mtd_read(mtd, 0, len, &bytes_read, dst);