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From d4348cbbdbdba5d045b5b389ba6ce97b74936f30 Mon Sep 17 00:00:00 2001
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From: Benjamin Berg <bberg@redhat.com>
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Date: Mon, 15 Jun 2020 16:17:43 +0200
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Subject: [PATCH] p2p: Limit P2P_DEVICE name to appropriate ifname size
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Otherwise the WPA_IF_P2P_DEVICE cannot be created. As this is not a
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netdev device, it is acceptable if the name is not completely unique. As
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such, simply insert a NUL byte at the appropriate place.
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---
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wpa_supplicant/p2p_supplicant.c | 4 ++++
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1 file changed, 4 insertions(+)
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diff --git a/wpa_supplicant/p2p_supplicant.c b/wpa_supplicant/p2p_supplicant.c
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index e94bffe52..17c25889c 100644
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--- a/wpa_supplicant/p2p_supplicant.c
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+++ b/wpa_supplicant/p2p_supplicant.c
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@@ -3929,6 +3929,10 @@ int wpas_p2p_add_p2pdev_interface(struct wpa_supplicant *wpa_s,
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wpa_s->ifname);
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if (os_snprintf_error(sizeof(ifname), ret))
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return -1;
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+ /* Cut length at the maximum size. Note that we don't need to ensure
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+ * collision free names here as the created interface is not a netdev.
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+ */
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+ ifname[IFNAMSIZ-1] = '\0';
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force_name[0] = '\0';
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wpa_s->pending_interface_type = WPA_IF_P2P_DEVICE;
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ret = wpa_drv_if_add(wpa_s, WPA_IF_P2P_DEVICE, ifname, NULL, NULL,
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--
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2.26.2
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