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UBSan: Avoid integer overflow in a loop index counter 

Split the check and decrementation into separate steps to avoid an
unnecessary UBSan warning.

hostapd.c:1895:14: runtime error: unsigned integer overflow: 0 - 1 cannot be represented in type 'size_t' (aka 'unsigned long')

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2019-02-23 16:28:16 +02:00
parent 8fc22fdde6
commit 9140caf5fb
1 changed files with 5 additions and 2 deletions
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7
src/ap/hostapd.c
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@ -1888,11 +1888,14 @@ static int hostapd_setup_interface_complete_sync(struct hostapd_iface *iface,
if (j)
os_memcpy(hapd->own_addr, prev_addr, ETH_ALEN);
if (hostapd_setup_bss(hapd, j == 0)) {
do {
for (;;) {
hapd = iface->bss[j];
hostapd_bss_deinit_no_free(hapd);
hostapd_free_hapd_data(hapd);
} while (j-- > 0);
if (j == 0)
break;
j--;
}
goto fail;
}
if (is_zero_ether_addr(hapd->conf->bssid))