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P2P: Limit P2P_DEVICE name to appropriate ifname size

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Otherwise the WPA_IF_P2P_DEVICE cannot be created if the base ifname is
long enough. As this is not a netdev device, it is acceptable if the
name is not completely unique. As such, simply insert a NUL byte at the
appropriate place.

Signed-off-by: Benjamin Berg <bberg@redhat.com>
This commit is contained in:
Benjamin Berg 2020-08-25 08:29:02 +02:00 committed by Jouni Malinen
parent 566ea1b7ce
commit c0b88d1291
1 changed files with 4 additions and 0 deletions
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4
wpa_supplicant/p2p_supplicant.c
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@ -3984,6 +3984,10 @@ int wpas_p2p_add_p2pdev_interface(struct wpa_supplicant *wpa_s,
wpa_s->ifname);
if (os_snprintf_error(sizeof(ifname), ret))
return -1;
/* Cut length at the maximum size. Note that we don't need to ensure
* collision free names here as the created interface is not a netdev.
*/
ifname[IFNAMSIZ - 1] = '\0';
force_name[0] = '\0';
wpa_s->pending_interface_type = WPA_IF_P2P_DEVICE;
ret = wpa_drv_if_add(wpa_s, WPA_IF_P2P_DEVICE, ifname, NULL, NULL,