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Sanity check the return from final_finish_mac

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The return value is checked for 0. This is currently safe but we should
really check for <= 0 since -1 is frequently used for error conditions.
Thanks to Kevin Wojtysiak (Int3 Solutions) and Paramjot Oberoi (Int3
Solutions) for reporting this issue.

Reviewed-by: Andy Polyakov <appro@openssl.org>
This commit is contained in:
Matt Caswell 2015-04-28 15:19:50 +01:00
parent 29b0a15a48
commit c427570e50
2 changed files with 1 additions and 2 deletions
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2
ssl/s3_both.c
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@ -168,7 +168,7 @@ int ssl3_send_finished(SSL *s, int a, int b, const char *sender, int slen)
i = s->method->ssl3_enc->final_finish_mac(s,
sender, slen,
s->s3->tmp.finish_md);
if (i == 0)
if (i <= 0)
return 0;
s->s3->tmp.finish_md_len = i;
memcpy(p, s->s3->tmp.finish_md, i);

1
ssl/ssl_locl.h
View File

@ -2073,7 +2073,6 @@ void dtls1_set_message_header(SSL *s,
__owur int dtls1_write_app_data_bytes(SSL *s, int type, const void *buf, int len);
__owur int dtls1_send_change_cipher_spec(SSL *s, int a, int b);
__owur int dtls1_send_finished(SSL *s, int a, int b, const char *sender, int slen);
__owur int dtls1_read_failed(SSL *s, int code);
__owur int dtls1_buffer_message(SSL *s, int ccs);
__owur int dtls1_retransmit_message(SSL *s, unsigned short seq,