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Avoid double free when processing DTLS packets.

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The |item| variable, in both of these cases, may contain a pointer to a
|pitem| structure within |s->d1->buffered_messages|. It was being freed
in the error case while still being in |buffered_messages|. When the
error later caused the |SSL*| to be destroyed, the item would be double
freed.

Thanks to Wah-Teh Chang for spotting that the fix in 1632ef74 was
inconsistent with the other error paths (but correct).

Fixes CVE-2014-3505

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Emilia Käsper <emilia@openssl.org>
This commit is contained in:
Adam Langley 2014-06-06 14:19:21 -07:00 committed by Matt Caswell
parent c34091d47e
commit 2172d4f63c
1 changed files with 2 additions and 4 deletions
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6
ssl/d1_both.c
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@ -693,8 +693,7 @@ dtls1_reassemble_fragment(SSL *s, struct hm_header_st* msg_hdr, int *ok)
return DTLS1_HM_FRAGMENT_RETRY;
err:
if (frag != NULL) dtls1_hm_fragment_free(frag);
if (item != NULL) OPENSSL_free(item);
if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag);
*ok = 0;
return i;
}
@ -778,8 +777,7 @@ dtls1_process_out_of_seq_message(SSL *s, struct hm_header_st* msg_hdr, int *ok)
return DTLS1_HM_FRAGMENT_RETRY;
err:
if ( frag != NULL) dtls1_hm_fragment_free(frag);
if ( item != NULL) OPENSSL_free(item);
if (frag != NULL && item == NULL) dtls1_hm_fragment_free(frag);
*ok = 0;
return i;
}