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79 lines
3.2 KiB
Diff
79 lines
3.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Sagar Verma <quic_sagarv@quicinc.com>
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Date: Sun, 12 Jun 2022 00:05:07 +0530
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Subject: [PATCH] AVRC: Validating msg size before accessing fields
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This change adds buffer length validation during the parsing of AVRCP
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browse commands.
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Change-Id: I3a6c7a9ea2323a04ce5c5368eabfa940a8152cba
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---
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stack/avrc/avrc_pars_tg.cc | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/stack/avrc/avrc_pars_tg.cc b/stack/avrc/avrc_pars_tg.cc
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index 7042f4da7..38c0ca385 100644
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--- a/stack/avrc/avrc_pars_tg.cc
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+++ b/stack/avrc/avrc_pars_tg.cc
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@@ -407,6 +407,12 @@ tAVRC_STS AVRC_Ctrl_ParsCommand(tAVRC_MSG* p_msg, tAVRC_COMMAND* p_result) {
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return status;
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}
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+#define RETURN_STATUS_IF_FALSE(_status_, _b_, _msg_, ...) \
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+ if (!(_b_)) { \
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+ AVRC_TRACE_DEBUG(_msg_, ##__VA_ARGS__); \
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+ return _status_; \
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+ }
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+
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/*******************************************************************************
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*
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* Function avrc_pars_browsing_cmd
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@@ -425,6 +431,7 @@ static tAVRC_STS avrc_pars_browsing_cmd(tAVRC_MSG_BROWSE* p_msg,
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tAVRC_STS status = AVRC_STS_NO_ERROR;
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uint8_t* p = p_msg->p_browse_data;
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int count;
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+ uint16_t min_len = 3;
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p_result->pdu = *p++;
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AVRC_TRACE_DEBUG("avrc_pars_browsing_cmd() pdu:0x%x", p_result->pdu);
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@@ -438,6 +445,7 @@ static tAVRC_STS avrc_pars_browsing_cmd(tAVRC_MSG_BROWSE* p_msg,
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break;
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case AVRC_PDU_GET_FOLDER_ITEMS: /* 0x71 */
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+ min_len += 10;
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STREAM_TO_UINT8(p_result->get_items.scope, p);
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// To be modified later here (Scope) when all browsing commands are
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// supported
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@@ -458,6 +466,11 @@ static tAVRC_STS avrc_pars_browsing_cmd(tAVRC_MSG_BROWSE* p_msg,
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if (buf_len < (count << 2))
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p_result->get_items.attr_count = count = (buf_len >> 2);
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for (int idx = 0; idx < count; idx++) {
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+ min_len += 4;
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+ RETURN_STATUS_IF_FALSE(AVRC_STS_BAD_CMD,
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+ (p_msg->browse_len >= min_len),
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+ "msg too short");
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+
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BE_STREAM_TO_UINT32(p_result->get_items.p_attr_list[idx], p);
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}
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}
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@@ -474,6 +487,7 @@ static tAVRC_STS avrc_pars_browsing_cmd(tAVRC_MSG_BROWSE* p_msg,
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break;
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case AVRC_PDU_GET_ITEM_ATTRIBUTES: /* 0x73 */
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+ min_len += 12;
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BE_STREAM_TO_UINT8(p_result->get_attrs.scope, p);
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if (p_result->get_attrs.scope > AVRC_SCOPE_NOW_PLAYING) {
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status = AVRC_STS_BAD_SCOPE;
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@@ -490,6 +504,11 @@ static tAVRC_STS avrc_pars_browsing_cmd(tAVRC_MSG_BROWSE* p_msg,
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p_result->get_attrs.attr_count = count = (buf_len >> 2);
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for (int idx = 0, count = 0; idx < p_result->get_attrs.attr_count;
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idx++) {
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+ min_len += 4;
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+ RETURN_STATUS_IF_FALSE(AVRC_STS_BAD_CMD,
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+ (p_msg->browse_len >= min_len),
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+ "msg too short");
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+
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BE_STREAM_TO_UINT32(p_result->get_attrs.p_attr_list[count], p);
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if (AVRC_IS_VALID_MEDIA_ATTRIBUTE(
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p_result->get_attrs.p_attr_list[count])) {
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