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Lukas Johannes Möller 5229e7d157 Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access 
commit dd815e6e39 upstream.

l2cap_information_rsp() checks that cmd_len covers the fixed
l2cap_info_rsp header (type + result, 4 bytes) but then reads
rsp->data without verifying that the payload is present:

 - L2CAP_IT_FEAT_MASK calls get_unaligned_le32(rsp->data), which reads
   4 bytes past the header (needs cmd_len >= 8).

 - L2CAP_IT_FIXED_CHAN reads rsp->data[0], 1 byte past the header
   (needs cmd_len >= 5).

A truncated L2CAP_INFO_RSP with result == L2CAP_IR_SUCCESS triggers an
out-of-bounds read of adjacent skb data.

Guard each data access with the required payload length check.  If the
payload is too short, skip the read and let the state machine complete
with safe defaults (feat_mask and remote_fixed_chan remain zero from
kzalloc), so the info timer cleanup and l2cap_conn_start() still run
and the connection is not stalled.

Fixes: 4e8402a3f8 ("[Bluetooth] Retrieve L2CAP features mask on connection setup")
Cc: stable@vger.kernel.org
Signed-off-by: Lukas Johannes Möller <research@johannes-moeller.dev>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-04-18 10:33:17 +02:00
..
6lowpan 6lowpan: iphc: Fix an off-by-one check of array index 2021-07-22 16:19:03 +02:00
9p net/9p: fix double req put in p9_fd_cancelled 2025-10-19 16:21:28 +02:00
802 net: 802: LLC+SNAP OID:PID lookup on start of skb data 2025-01-23 17:15:49 +01:00
8021q net: vlan: sync VLAN features with lower device 2025-12-07 06:09:26 +09:00
appletalk net: appletalk: Fix use-after-free in AARP proxy probe 2025-08-28 16:24:04 +02:00
atm atm: lec: fix null-ptr-deref in lec_arp_clear_vccs 2026-04-18 10:33:10 +02:00
ax25 ax25: properly unshare skbs in ax25_kiss_rcv() 2025-09-09 18:50:20 +02:00
batman-adv batman-adv: Avoid double-rtnl_lock ELP metric worker 2026-04-18 10:33:15 +02:00
bluetooth Bluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access 2026-04-18 10:33:17 +02:00
bpf bpf: Do not let BPF test infra emit invalid GSO types to stack 2026-02-06 16:41:58 +01:00
bpfilter bpfilter: Specify the log level for the kmsg message 2021-06-25 13:13:50 +02:00
bridge net: bridge: fix nd_tbl NULL dereference when IPv6 is disabled 2026-04-18 10:33:10 +02:00
caif caif: fix integer underflow in cffrml_receive() 2026-01-19 13:09:44 +01:00
can can: bcm: fix locking for bcm_op runtime updates 2026-04-18 10:33:10 +02:00
ceph libceph: admit message frames only in CEPH_CON_S_OPEN state 2026-04-18 10:33:14 +02:00
core net: consume xmit errors of GSO frames 2026-03-04 07:20:24 -05:00
dcb net: dcb: choose correct policy to parse DCB_ATTR_BCN 2023-08-11 15:13:53 +02:00
dccp net: fix data-races around sk->sk_forward_alloc 2025-01-23 17:16:04 +01:00
dns_resolver keys, dns: Fix size check of V1 server-list header 2024-01-25 14:52:46 -08:00
dsa net: dsa: free routing table on probe failure 2026-02-19 16:21:45 +01:00
ethernet gro: remove rcu_read_lock/rcu_read_unlock from gro_complete handlers 2024-09-12 11:07:47 +02:00
ethtool ethtool: add support to set/get tx copybreak buf size via ethtool 2026-03-04 07:19:36 -05:00
hsr net/hsr: fix NULL pointer dereference in prp_get_untagged_frame() 2026-01-19 13:09:46 +01:00
ieee802154 net: ieee802154: do not leave a dangling sk pointer in ieee802154_create() 2024-12-14 19:51:37 +01:00
ife net: sched: ife: fix potential use-after-free 2024-01-05 15:13:29 +01:00
ipv4 ipv4: fib: Annotate access to struct fib_alias.fa_state. 2026-03-04 07:20:10 -05:00
ipv6 net: ipv6: fix panic when IPv4 route references loopback IPv6 nexthop 2026-04-18 10:33:10 +02:00
iucv s390/iucv: fix receive buffer virtual vs physical address confusion 2024-09-04 13:23:27 +02:00
kcm kcm: Serialise kcm_sendmsg() for the same socket. 2024-09-04 13:23:32 +02:00
key Revert "xfrm: destroy xfrm_state synchronously on net exit path" 2026-01-19 13:09:18 +01:00
l2tp l2tp: do not use sock_hold() in pppol2tp_session_get_sock() 2026-04-18 10:33:17 +02:00
l3mdev net: Add l3mdev index to flow struct and avoid oif reset for port devices 2024-10-17 15:11:57 +02:00
lapb net: lapb: Use list_for_each_entry() to simplify code in lapb_iface.c 2021-06-08 16:31:25 -07:00
llc llc: fix data loss when reading from a socket in llc_ui_recvmsg() 2025-06-04 14:38:06 +02:00
mac80211 wifi: mac80211: fix NULL pointer dereference in mesh_rx_csa_frame() 2026-04-18 10:33:09 +02:00
mac802154 mac802154: check local interfaces before deleting sdata list 2025-01-23 17:16:00 +01:00
mctp net: mctp: Prevent duplicate binds 2025-08-28 16:24:20 +02:00
mpls mpls: Use rcu_dereference_rtnl() in mpls_route_input_rcu(). 2025-06-27 11:05:36 +01:00
mptcp mptcp: fix race in mptcp_pm_nl_flush_addrs_doit() 2026-02-19 16:21:45 +01:00
ncsi net: ncsi: fix skb leak in error paths 2026-04-18 10:33:15 +02:00
netfilter netfilter: xt_IDLETIMER: reject rev0 reuse of ALARM timer labels 2026-04-18 10:33:12 +02:00
netlabel calipso: unlock rcu before returning -EAFNOSUPPORT 2025-06-27 11:05:22 +01:00
netlink netlink: avoid infinite retry looping in netlink_unicast() 2025-08-28 16:24:15 +02:00
netrom netrom: fix double-free in nr_route_frame() 2026-02-06 16:41:58 +01:00
nfc nfc: rawsock: cancel tx_work before socket teardown 2026-04-18 10:33:10 +02:00
nsh nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment(). 2024-05-17 11:50:48 +02:00
openvswitch net: openvswitch: Avoid needlessly taking the RTNL on vport destroy 2026-01-19 13:09:56 +01:00
packet net/packet: fix a race in packet_set_ring() and packet_notifier() 2025-08-28 16:24:14 +02:00
phonet phonet/pep: Move call to pn_skb_get_dst_sockaddr() earlier in pep_sock_accept() 2025-08-28 16:23:59 +02:00
psample psample: Require 'CAP_NET_ADMIN' when joining "packets" group 2023-12-13 18:36:37 +01:00
qrtr net: qrtr: Update packets cloning when broadcasting 2024-10-17 15:11:08 +02:00
rds net/rds: Clear reconnect pending bit 2026-03-04 07:20:11 -05:00
rfkill net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer 2025-10-02 13:39:09 +02:00
rose net: rose: fix invalid array index in rose_kill_by_device() 2026-01-19 13:09:58 +01:00
rxrpc rxrpc: Fix oops due to non-existence of prealloc backlog struct 2025-07-17 18:30:48 +02:00
sched net/sched: teql: fix NULL pointer dereference in iptunnel_xmit on TEQL slave xmit 2026-04-18 10:33:12 +02:00
sctp sctp: move SCTP_CMD_ASSOC_SHKEY right after SCTP_CMD_PEER_INIT 2026-02-06 16:41:52 +01:00
smc net/smc: fix mismatch between CLC header and proposal 2025-12-07 06:09:27 +09:00
strparser strparser: Fix signed/unsigned mismatch bug 2025-12-07 06:09:29 +09:00
sunrpc sunrpc: fix cache_request leak in cache_release 2026-04-18 10:33:17 +02:00
switchdev net: make switchdev_bridge_port_{,unoffload} loosely coupled with the bridge 2021-08-04 12:35:07 +01:00
tipc tipc: fix divide-by-zero in tipc_sk_filter_connect() 2026-04-18 10:33:14 +02:00
tls tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock(). 2026-02-06 16:42:01 +01:00
unix af_unix: Don't leave consecutive consumed OOB skbs. 2025-10-02 13:39:14 +02:00
vmw_vsock vmw_vsock: bypass false-positive Wnonnull warning with gcc-16 2026-03-04 07:20:11 -05:00
wireless wifi: radiotap: reject radiotap with unknown bits 2026-04-18 10:33:09 +02:00
x25 net/x25: fix incorrect parameter validation in the x25_getsockopt() function 2024-03-26 18:21:23 -04:00
xdp xsk: fix OOB map writes when deleting elements 2024-12-14 19:51:33 +01:00
xfrm espintcp: fix skb leaks 2026-02-06 16:42:03 +01:00
compat.c net: Return the correct errno code 2021-06-03 15:13:56 -07:00
devres.c net: devres: Correct a grammatical error 2021-06-11 12:55:28 -07:00
Kconfig Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
Makefile Remove DECnet support from kernel 2023-06-21 15:59:15 +02:00
socket.c net: Remove RTNL dance for SIOCBRADDIF and SIOCBRDELIF. 2026-01-19 13:10:11 +01:00
sysctl_net.c net: Ensure net namespace isolation of sysctls 2021-04-12 13:27:11 -07:00