target/linux/brcm47xx/patches-3.18/031-04-MIPS-BCM47XX-Use-strnchr-to-avoid-reading-out-of-the.patch

   1 From 80aaaa8b93d860f828e2cf883f307894640765f0 Mon Sep 17 00:00:00 2001
   2 From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
   3 Date: Wed, 10 Dec 2014 11:49:54 +0100
   4 Subject: [PATCH] MIPS: BCM47XX: Use strnchr to avoid reading out of the buffer
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
  10 Cc: Hauke Mehrtens <hauke@hauke-m.de>
  11 Cc: Paul Walmsley <paul@pwsan.com>
  12 Cc: linux-mips@linux-mips.org
  13 Patchwork: https://patchwork.linux-mips.org/patch/8662/
  14 Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
  15 ---
  16  arch/mips/bcm47xx/nvram.c | 6 ++++--
  17  1 file changed, 4 insertions(+), 2 deletions(-)
  18
  19 diff --git a/arch/mips/bcm47xx/nvram.c b/arch/mips/bcm47xx/nvram.c
  20 index 5e4ae04..d805d8a 100644
  21 --- a/arch/mips/bcm47xx/nvram.c
  22 +++ b/arch/mips/bcm47xx/nvram.c
  23 @@ -175,7 +175,7 @@ static int nvram_init(void)
  24  int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
  25  {
  26         char *var, *value, *end, *eq;
  27 -       int err;
  28 +       int data_left, err;
  29
  30         if (!name)
  31                 return -EINVAL;
  32 @@ -191,7 +191,9 @@ int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
  33         end = nvram_buf + sizeof(nvram_buf) - 2;
  34         end[0] = end[1] = '\0';
  35         for (; *var; var = value + strlen(value) + 1) {
  36 -               eq = strchr(var, '=');
  37 +               data_left = end - var;
  38 +
  39 +               eq = strnchr(var, data_left, '=');
  40                 if (!eq)
  41                         break;
  42                 value = eq + 1;
  43 --
  44 1.8.4.5
  45