Hui Peng 6d91041bb3 Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame() ... While rfcomm_recv_frame() verifies that skb->len is at least sizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame with an extended 2-byte length field (!__test_ea(hdr->len)) has a 4-byte header plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2). When a 4-byte RFCOMM frame with EA == 0 arrives: 1. The initial skb->len < sizeof(*hdr) + 1 check passes (4 < 4 is false). 2. Trimming the FCS byte decrements skb->len to 3. 3. If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 > 3) and returns NULL without advancing skb->data. 4. Because the return value of skb_pull() is ignored, the un-pulled 3-byte struct rfcomm_hdr remains at skb->data and is either queued as application payload via rfcomm_recv_data() or parsed as a multiplexer control command via rfcomm_recv_mcc() on DLCI 0. Fix this by extending the length check in rfcomm_recv_frame() to also require skb->len >= sizeof(*hdr) + 2 when !__test_ea(hdr->len). Fixes: b230e5bf50 ("Bluetooth: RFCOMM: validate skb length in rfcomm_recv_frame") Assisted-by: LLM Signed-off-by: Hui Peng <benquike@gmail.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>		2026-09-21 09:37:20 -04:00
..
core.c	Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()	2026-09-21 09:37:20 -04:00
Kconfig	Bluetooth: fix BT dependency for submodules	2026-08-07 15:38:30 -04:00
Makefile	Bluetooth: enable context analysis	2026-08-07 12:27:20 -04:00
sock.c	Bluetooth: RFCOMM: fix NULL dereference of dlc->session in RFCOMM_CONNINFO	2026-09-21 09:37:20 -04:00
tty.c	Bluetooth: RFCOMM: Fix session UAF in set_termios	2026-07-20 17:41:07 -04:00