Bluetooth: bnep: fix out-of-bounds reads on short RX/TX frames and control fallthrough

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Fix multiple out-of-bounds reads in Bluetooth BNEP frame processing:

1. In bnep_rx_frame() and bnep_ctrl_frame() (net/bluetooth/bnep/core.c),
   use pskb_may_pull() to verify the BNEP header, control type byte,
   filter count, and extension headers exist before reading them, and
   return 0 after handling BNEP_CONTROL instead of falling through to
   Ethernet frame submission when no extension headers follow.
2. In bnep_net_xmit() (net/bluetooth/bnep/netdev.c), verify skb->len >=
   ETH_HLEN with pskb_may_pull() before reading the 14-byte Ethernet
   header to prevent an out-of-bounds heap read and infoleak on short
   AF_PACKET TX frames.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Assisted-by: LLM
Signed-off-by: Hui Peng <benquike@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

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Hui Peng 2026-09-19 22:17:38 +00:00 • committed by Luiz Augusto von Dentz

parent b5dbb41b21

commit f0ca020cbb

2 changed files with 23 additions and 2 deletions

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17

net/bluetooth/bnep/core.c

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8

net/bluetooth/bnep/netdev.c

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