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Fix wpa_config_parse_string() to null terminate printf decoded values

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printf_decode() fills in a binary buffer and returns the length of
the written data. This did not use null termination since initial
use cases used the output as a binary value. However, Hotspot 2.0
cred block values are also using this for parsing strings. Those
cases could end up without proper null termination depending on what
os_malloc() ends up getting as the memory buffer. Fix these and make
printf_decode() more convenient by forcing the output buffer to be
null terminated.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>
This commit is contained in:
Kyeyoon Park 2013-09-25 12:34:35 +03:00 committed by Jouni Malinen
parent 04e533e249
commit 913c19c6e5
1 changed files with 3 additions and 1 deletions
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4
src/utils/common.c
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@ -400,7 +400,7 @@ size_t printf_decode(u8 *buf, size_t maxlen, const char *str)
int val; int val;
while (*pos) { while (*pos) {
if (len == maxlen) if (len + 1 >= maxlen)
break; break;
switch (*pos) { switch (*pos) {
case '\\': case '\\':
@ -468,6 +468,8 @@ size_t printf_decode(u8 *buf, size_t maxlen, const char *str)
break; break;
} }
} }
if (maxlen > len)
buf[len] = '\0';
return len; return len;
} }