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MIPS: BCM47XX: Use strnchr to avoid reading out of the buffer 

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Cc: Hauke Mehrtens <hauke@hauke-m.de>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/8662/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Rafał Miłecki 2014-12-10 11:49:54 +01:00 committed by Ralf Baechle
parent 23d2bc42ac
commit 80aaaa8b93
1 changed files with 4 additions and 2 deletions
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6
arch/mips/bcm47xx/nvram.c
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@ -175,7 +175,7 @@ static int nvram_init(void)
int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
{
char *var, *value, *end, *eq;
int err;
int data_left, err;
if (!name)
return -EINVAL;
@ -191,7 +191,9 @@ int bcm47xx_nvram_getenv(const char *name, char *val, size_t val_len)
end = nvram_buf + sizeof(nvram_buf) - 2;
end[0] = end[1] = '\0';
for (; *var; var = value + strlen(value) + 1) {
eq = strchr(var, '=');
data_left = end - var;
eq = strnchr(var, data_left, '=');
if (!eq)
break;
value = eq + 1;