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From 22151b111b493d4604c9490327c40fdac7bc4b37 Mon Sep 17 00:00:00 2001
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Message-Id: <22151b111b493d4604c9490327c40fdac7bc4b37.1525684664.git.davide.caratti@gmail.com>
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From: Davide Caratti <davide.caratti@gmail.com>
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Date: Thu, 8 Mar 2018 17:15:02 +0100
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Subject: [PATCH] wpa_supplicant: Fix memory leaks in
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ieee802_1x_create_preshared_mka()
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In case MKA is initialized successfully, local copies of CAK and CKN
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were allocated, but never freed. Ensure that such memory is released
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also when ieee802_1x_kay_create_mka() returns a valid pointer.
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Fixes: ad51731abf06 ("wpa_supplicant: Allow pre-shared (CAK,CKN) pair for MKA")
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Signed-off-by: Davide Caratti <davide.caratti@gmail.com>
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---
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wpa_supplicant/wpas_kay.c | 32 +++++++++++++++-----------------
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1 file changed, 15 insertions(+), 17 deletions(-)
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diff --git a/wpa_supplicant/wpas_kay.c b/wpa_supplicant/wpas_kay.c
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index 11708b8a6..d3d06b8ae 100644
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--- a/wpa_supplicant/wpas_kay.c
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+++ b/wpa_supplicant/wpas_kay.c
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@@ -392,25 +392,25 @@ void * ieee802_1x_create_preshared_mka(struct wpa_supplicant *wpa_s,
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{
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struct mka_key *cak;
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struct mka_key_name *ckn;
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- void *res;
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+ void *res = NULL;
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if ((ssid->mka_psk_set & MKA_PSK_SET) != MKA_PSK_SET)
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- return NULL;
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-
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- if (ieee802_1x_alloc_kay_sm(wpa_s, ssid) < 0)
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- return NULL;
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-
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- if (!wpa_s->kay || wpa_s->kay->policy == DO_NOT_SECURE)
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- return NULL;
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+ goto end;
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ckn = os_zalloc(sizeof(*ckn));
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if (!ckn)
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- goto dealloc;
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+ goto end;
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cak = os_zalloc(sizeof(*cak));
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if (!cak)
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goto free_ckn;
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+ if (ieee802_1x_alloc_kay_sm(wpa_s, ssid) < 0 || !wpa_s->kay)
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+ goto free_cak;
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+
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+ if (wpa_s->kay->policy == DO_NOT_SECURE)
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+ goto dealloc;
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+
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cak->len = MACSEC_CAK_LEN;
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os_memcpy(cak->key, ssid->mka_cak, cak->len);
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@@ -419,17 +419,15 @@ void * ieee802_1x_create_preshared_mka(struct wpa_supplicant *wpa_s,
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res = ieee802_1x_kay_create_mka(wpa_s->kay, ckn, cak, 0, PSK, FALSE);
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if (res)
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- return res;
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+ goto free_cak;
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+dealloc:
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/* Failed to create MKA */
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+ ieee802_1x_dealloc_kay_sm(wpa_s);
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+free_cak:
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os_free(cak);
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-
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- /* fallthrough */
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-
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free_ckn:
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os_free(ckn);
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-dealloc:
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- ieee802_1x_dealloc_kay_sm(wpa_s);
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-
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- return NULL;
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+end:
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+ return res;
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}
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--
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2.14.3
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