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Disallow zero length signature algorithms

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Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2840)
This commit is contained in:
Dr. Stephen Henson 2017-03-03 02:44:18 +00:00
parent 224b4e37c0
commit 8f12296e23
2 changed files with 2 additions and 1 deletions
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1
ssl/statem/statem_srvr.c
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@ -2497,6 +2497,7 @@ int tls_construct_certificate_request(SSL *s, WPACKET *pkt)
size_t nl = tls12_get_psigalgs(s, 1, &psigs);
if (!WPACKET_start_sub_packet_u16(pkt)
|| !WPACKET_set_flags(pkt, WPACKET_FLAGS_NON_ZERO_LENGTH)
|| !tls12_copy_sigalgs(s, pkt, psigs, nl)
|| !WPACKET_close(pkt)) {
SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST,

2
ssl/t1_lib.c
View File

@ -1563,7 +1563,7 @@ int tls1_save_sigalgs(SSL *s, PACKET *pkt)
size = PACKET_remaining(pkt);
/* Invalid data length */
if ((size & 1) != 0)
if (size == 0 || (size & 1) != 0)
return 0;
size >>= 1;