DGNum/hostapd
6
0
Fork 0
Code Issues Pull requests 1 Projects Releases Packages Wiki Activity Actions

hs20-osu-client: Explicit checks for snprintf() result

Browse source 
Get rid of the gcc warnings on potentially truncating the output buffer
by explicitly checking that there was enough room to write the full
string.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2022-05-27 00:23:25 +03:00
parent cd92f7f98a
commit 02047e9c88
1 changed files with 57 additions and 21 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

78
hs20/client/osu_client.c
View file

@ -2018,6 +2018,7 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
struct osu_data *osu = NULL, *last = NULL;
size_t osu_count = 0;
char *pos, *end;
int res;
f = fopen(fname, "r");
if (f == NULL) {
@ -2037,15 +2038,20 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
osu = last;
last = &osu[osu_count++];
memset(last, 0, sizeof(*last));
snprintf(last->bssid, sizeof(last->bssid), "%s",
buf + 13);
res = os_snprintf(last->bssid, sizeof(last->bssid),
"%s", buf + 13);
if (os_snprintf_error(sizeof(last->bssid), res))
break;
continue;
}
if (!last)
continue;
if (strncmp(buf, "uri=", 4) == 0) {
snprintf(last->url, sizeof(last->url), "%s", buf + 4);
res = os_snprintf(last->url, sizeof(last->url),
"%s", buf + 4);
if (os_snprintf_error(sizeof(last->url), res))
break;
continue;
}
@ -2055,26 +2061,37 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
}
if (strncmp(buf, "osu_ssid=", 9) == 0) {
snprintf(last->osu_ssid, sizeof(last->osu_ssid),
"%s", buf + 9);
res = os_snprintf(last->osu_ssid,
sizeof(last->osu_ssid),
"%s", buf + 9);
if (os_snprintf_error(sizeof(last->osu_ssid), res))
break;
continue;
}
if (strncmp(buf, "osu_ssid2=", 10) == 0) {
snprintf(last->osu_ssid2, sizeof(last->osu_ssid2),
"%s", buf + 10);
res = os_snprintf(last->osu_ssid2,
sizeof(last->osu_ssid2),
"%s", buf + 10);
if (os_snprintf_error(sizeof(last->osu_ssid2), res))
break;
continue;
}
if (os_strncmp(buf, "osu_nai=", 8) == 0) {
os_snprintf(last->osu_nai, sizeof(last->osu_nai),
"%s", buf + 8);
res = os_snprintf(last->osu_nai, sizeof(last->osu_nai),
"%s", buf + 8);
if (os_snprintf_error(sizeof(last->osu_nai), res))
break;
continue;
}
if (os_strncmp(buf, "osu_nai2=", 9) == 0) {
os_snprintf(last->osu_nai2, sizeof(last->osu_nai2),
"%s", buf + 9);
res = os_snprintf(last->osu_nai2,
sizeof(last->osu_nai2),
"%s", buf + 9);
if (os_snprintf_error(sizeof(last->osu_nai2), res))
break;
continue;
}
@ -2087,8 +2104,14 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
continue;
*pos++ = '\0';
txt = &last->friendly_name[last->friendly_name_count++];
snprintf(txt->lang, sizeof(txt->lang), "%s", buf + 14);
snprintf(txt->text, sizeof(txt->text), "%s", pos);
res = os_snprintf(txt->lang, sizeof(txt->lang),
"%s", buf + 14);
if (os_snprintf_error(sizeof(txt->lang), res))
break;
res = os_snprintf(txt->text, sizeof(txt->text),
"%s", pos);
if (os_snprintf_error(sizeof(txt->text), res))
break;
}
if (strncmp(buf, "desc=", 5) == 0) {
@ -2100,8 +2123,14 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
continue;
*pos++ = '\0';
txt = &last->serv_desc[last->serv_desc_count++];
snprintf(txt->lang, sizeof(txt->lang), "%s", buf + 5);
snprintf(txt->text, sizeof(txt->text), "%s", pos);
res = os_snprintf(txt->lang, sizeof(txt->lang),
"%s", buf + 5);
if (os_snprintf_error(sizeof(txt->lang), res))
break;
res = os_snprintf(txt->text, sizeof(txt->text),
"%s", pos);
if (os_snprintf_error(sizeof(txt->text), res))
break;
}
if (strncmp(buf, "icon=", 5) == 0) {
@ -2124,23 +2153,30 @@ static struct osu_data * parse_osu_providers(const char *fname, size_t *count)
if (!end)
continue;
*end = '\0';
snprintf(icon->lang, sizeof(icon->lang), "%s", pos);
res = os_snprintf(icon->lang, sizeof(icon->lang),
"%s", pos);
if (os_snprintf_error(sizeof(icon->lang), res))
break;
pos = end + 1;
end = strchr(pos, ':');
if (end)
*end = '\0';
snprintf(icon->mime_type, sizeof(icon->mime_type),
"%s", pos);
if (!pos)
res = os_snprintf(icon->mime_type,
sizeof(icon->mime_type), "%s", pos);
if (os_snprintf_error(sizeof(icon->mime_type), res))
break;
if (!end)
continue;
pos = end + 1;
end = strchr(pos, ':');
if (end)
*end = '\0';
snprintf(icon->filename, sizeof(icon->filename),
"%s", pos);
res = os_snprintf(icon->filename,
sizeof(icon->filename), "%s", pos);
if (os_snprintf_error(sizeof(icon->filename), res))
break;
continue;
}
}