From:   =?UTF-8?q?=C5=81ukasz=20Rymanowski?= 
        <lukasz.rymanowski@codecoup.pl>
To:     linux-bluetooth@vger.kernel.org
Cc:     =?UTF-8?q?=C5=81ukasz=20Rymanowski?= 
        <lukasz.rymanowski@codecoup.pl>
Subject: [PATCH BlueZ] btmon: Fix decoding truncated data
Date:   Mon,  6 Mar 2023 15:52:17 +0100
Message-Id: <20230306145217.7662-1-lukasz.rymanowski@codecoup.pl>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Some platforms use different filtering and for this purpose,
some of the ACL/SCO/ISO/SDP data are truncated.

In such a case, included lenght is smaller the original size.
Without this fix, btmon stops working after first truncated packet.
---
 src/shared/btsnoop.c | 2 +-
 tools/btsnoop.c      | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/src/shared/btsnoop.c b/src/shared/btsnoop.c
index 0a68282bc..8b93203b3 100644
--- a/src/shared/btsnoop.c
+++ b/src/shared/btsnoop.c
@@ -513,7 +513,7 @@ bool btsnoop_read_hci(struct btsnoop *btsnoop, struct timeval *tv,
 		return false;
 	}
 
-	toread = be32toh(pkt.size);
+	toread = be32toh(pkt.len);
 	if (toread > BTSNOOP_MAX_PACKET_SIZE) {
 		btsnoop->aborted = true;
 		return false;
diff --git a/tools/btsnoop.c b/tools/btsnoop.c
index a0d6cf356..efaa45db4 100644
--- a/tools/btsnoop.c
+++ b/tools/btsnoop.c
@@ -283,7 +283,7 @@ next_packet:
 	if (len < 0 || len != BTSNOOP_PKT_SIZE)
 		goto close_input;
 
-	toread = be32toh(pkt.size);
+	toread = be32toh(pkt.len);
 	flags = be32toh(pkt.flags);
 
 	opcode = flags & 0x00ff;
@@ -356,7 +356,7 @@ next_packet:
 	if (len < 0 || len != BTSNOOP_PKT_SIZE)
 		goto close_input;
 
-	toread = be32toh(pkt.size);
+	toread = be32toh(pkt.len);
 	flags = be32toh(pkt.flags);
 
 	opcode = flags & 0x00ff;
@@ -433,7 +433,7 @@ next_packet:
 	if (len < 0 || len != BTSNOOP_PKT_SIZE)
 		goto close_input;
 
-	toread = be32toh(pkt.size);
+	toread = be32toh(pkt.len);
 
 	len = read(fd, buf, toread);
 	if (len < 0 || len != (ssize_t) toread) {
-- 
2.34.1