61 lines
2.0 KiB
Diff
61 lines
2.0 KiB
Diff
From 75a937d97f4fefc6f9b08e3791f151445f551cb3 Mon Sep 17 00:00:00 2001
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From: Daiki Ueno <ueno@gnu.org>
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Date: Fri, 29 Jan 2021 14:06:23 +0100
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Subject: [PATCH 2/2] pre_shared_key: avoid use-after-free around realloc
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Signed-off-by: Daiki Ueno <ueno@gnu.org>
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---
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lib/ext/pre_shared_key.c | 15 ++++++++++++---
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1 file changed, 12 insertions(+), 3 deletions(-)
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diff --git a/lib/ext/pre_shared_key.c b/lib/ext/pre_shared_key.c
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index a042c6488..380bf39ed 100644
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--- a/lib/ext/pre_shared_key.c
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+++ b/lib/ext/pre_shared_key.c
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@@ -267,7 +267,7 @@ client_send_params(gnutls_session_t session,
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size_t spos;
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gnutls_datum_t username = {NULL, 0};
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gnutls_datum_t user_key = {NULL, 0}, rkey = {NULL, 0};
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- gnutls_datum_t client_hello;
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+ unsigned client_hello_len;
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unsigned next_idx;
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const mac_entry_st *prf_res = NULL;
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const mac_entry_st *prf_psk = NULL;
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@@ -428,8 +428,7 @@ client_send_params(gnutls_session_t session,
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assert(extdata->length >= sizeof(mbuffer_st));
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assert(ext_offset >= (ssize_t)sizeof(mbuffer_st));
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ext_offset -= sizeof(mbuffer_st);
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- client_hello.data = extdata->data+sizeof(mbuffer_st);
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- client_hello.size = extdata->length-sizeof(mbuffer_st);
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+ client_hello_len = extdata->length-sizeof(mbuffer_st);
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next_idx = 0;
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@@ -440,6 +439,11 @@ client_send_params(gnutls_session_t session,
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}
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if (prf_res && rkey.size > 0) {
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+ gnutls_datum_t client_hello;
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+
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+ client_hello.data = extdata->data+sizeof(mbuffer_st);
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+ client_hello.size = client_hello_len;
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+
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ret = compute_psk_binder(session, prf_res,
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binders_len, binders_pos,
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ext_offset, &rkey, &client_hello, 1,
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@@ -474,6 +478,11 @@ client_send_params(gnutls_session_t session,
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}
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if (prf_psk && user_key.size > 0 && info) {
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+ gnutls_datum_t client_hello;
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+
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+ client_hello.data = extdata->data+sizeof(mbuffer_st);
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+ client_hello.size = client_hello_len;
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+
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ret = compute_psk_binder(session, prf_psk,
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binders_len, binders_pos,
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ext_offset, &user_key, &client_hello, 0,
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--
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2.30.2
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