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HS 2.0: Clarify OSU Friendly Name length validation

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This extends the changes in commit 0570a3ea7d ("HS 2.0: Clarify OSU
Provider list length validation") to cover the length field for the OSU
Friendly Name value to try to get this easier for static analyzers to
understand.

Signed-off-by: Jouni Malinen <jouni@codeaurora.org>
This commit is contained in:
Jouni Malinen 2020-11-03 19:56:39 +02:00 committed by Jouni Malinen
parent 05962099c3
commit ec0d99c00e
1 changed files with 15 additions and 4 deletions
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19
wpa_supplicant/hs20_supplicant.c
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@ -901,14 +901,25 @@ static void hs20_osu_add_prov(struct wpa_supplicant *wpa_s, struct wpa_bss *bss,
/* OSU Friendly Name Duples */ /* OSU Friendly Name Duples */
while (pos - pos2 >= 4 && prov->friendly_name_count < OSU_MAX_ITEMS) { while (pos - pos2 >= 4 && prov->friendly_name_count < OSU_MAX_ITEMS) {
struct osu_lang_string *f; struct osu_lang_string *f;
if (1 + pos2[0] > pos - pos2 || pos2[0] < 3) { u8 slen;
slen = pos2[0];
if (1 + slen > pos - pos2) {
wpa_printf(MSG_DEBUG, "Invalid OSU Friendly Name"); wpa_printf(MSG_DEBUG, "Invalid OSU Friendly Name");
break; break;
} }
if (slen < 3) {
wpa_printf(MSG_DEBUG,
"Invalid OSU Friendly Name (no room for language)");
break;
}
f = &prov->friendly_name[prov->friendly_name_count++]; f = &prov->friendly_name[prov->friendly_name_count++];
os_memcpy(f->lang, pos2 + 1, 3); pos2++;
os_memcpy(f->text, pos2 + 1 + 3, pos2[0] - 3); os_memcpy(f->lang, pos2, 3);
pos2 += 1 + pos2[0]; pos2 += 3;
slen -= 3;
os_memcpy(f->text, pos2, slen);
pos2 += slen;
} }
/* OSU Server URI */ /* OSU Server URI */