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[71.56.157.77]) by smtp.gmail.com with ESMTPSA id h76sm2198410pfe.161.2021.04.30.17.37.19 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Apr 2021 17:37:19 -0700 (PDT) From: Luiz Augusto von Dentz To: linux-bluetooth@vger.kernel.org Subject: [PATCH BlueZ 1/3] avdtp: Fix accepting invalid/malformed capabilities Date: Fri, 30 Apr 2021 17:37:15 -0700 Message-Id: <20210501003717.7553-1-luiz.dentz@gmail.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org From: Luiz Augusto von Dentz Check if capabilities are valid before attempting to copy them. --- profiles/audio/avdtp.c | 56 +++++++++++++++++++++++++++--------------- 1 file changed, 36 insertions(+), 20 deletions(-) diff --git a/profiles/audio/avdtp.c b/profiles/audio/avdtp.c index 623fe30d3..c7bf99f42 100644 --- a/profiles/audio/avdtp.c +++ b/profiles/audio/avdtp.c @@ -1305,43 +1305,53 @@ struct avdtp_remote_sep *avdtp_find_remote_sep(struct avdtp *session, return NULL; } -static GSList *caps_to_list(uint8_t *data, int size, +static GSList *caps_to_list(uint8_t *data, size_t size, struct avdtp_service_capability **codec, gboolean *delay_reporting) { + struct avdtp_service_capability *cap; GSList *caps; - int processed; if (delay_reporting) *delay_reporting = FALSE; - for (processed = 0, caps = NULL; processed + 2 <= size;) { - struct avdtp_service_capability *cap; - uint8_t length, category; + if (size < sizeof(*cap)) + return NULL; + + for (caps = NULL; size >= sizeof(*cap);) { + struct avdtp_service_capability *cpy; - category = data[0]; - length = data[1]; + cap = (struct avdtp_service_capability *)data; - if (processed + 2 + length > size) { + if (sizeof(*cap) + cap->length >= size) { error("Invalid capability data in getcap resp"); break; } - cap = g_malloc(sizeof(struct avdtp_service_capability) + - length); - memcpy(cap, data, 2 + length); + if (cap->category == AVDTP_MEDIA_CODEC && + cap->length < sizeof(**codec)) { + error("Invalid codec data in getcap resp"); + break; + } + + cpy = btd_malloc(sizeof(*cpy) + cap->length); + memcpy(cpy, cap, sizeof(*cap) + cap->length); - processed += 2 + length; - data += 2 + length; + size -= sizeof(*cap) + cap->length; + data += sizeof(*cap) + cap->length; - caps = g_slist_append(caps, cap); + caps = g_slist_append(caps, cpy); - if (category == AVDTP_MEDIA_CODEC && - length >= - sizeof(struct avdtp_media_codec_capability)) - *codec = cap; - else if (category == AVDTP_DELAY_REPORTING && delay_reporting) - *delay_reporting = TRUE; + switch (cap->category) { + case AVDTP_MEDIA_CODEC: + if (codec) + *codec = cap; + break; + case AVDTP_DELAY_REPORTING: + if (delay_reporting) + *delay_reporting = TRUE; + break; + } } return caps; @@ -1538,6 +1548,12 @@ static gboolean avdtp_setconf_cmd(struct avdtp *session, uint8_t transaction, &stream->codec, &stream->delay_reporting); + if (!stream->caps || !stream->codec) { + err = AVDTP_UNSUPPORTED_CONFIGURATION; + category = 0x00; + goto failed_stream; + } + /* Verify that the Media Transport capability's length = 0. Reject otherwise */ for (l = stream->caps; l != NULL; l = g_slist_next(l)) { struct avdtp_service_capability *cap = l->data;