[PW_SID:1092984] Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()#3000
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l2cap_sock_new_connection_cb() accesses l2cap_pi(sk)->chan after release_sock(parent). Once the parent lock is released, the child socket sk can be freed by another task. Save the channel pointer into a local variable while the parent lock is still held to prevent this. Fixes: 8ffb929 ("Bluetooth: Remove parent socket usage from l2cap_core.c") Cc: stable@kernel.org Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Siwei Zhang <oss@fourdim.xyz>
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l2cap_sock_new_connection_cb() accesses l2cap_pi(sk)->chan after
release_sock(parent). Once the parent lock is released, the child
socket sk can be freed by another task.
Save the channel pointer into a local variable while the parent lock
is still held to prevent this.
Fixes: 8ffb929 ("Bluetooth: Remove parent socket usage from l2cap_core.c")
Cc: stable@kernel.org
Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Siwei Zhang oss@fourdim.xyz
net/bluetooth/6lowpan.c | 5 +++++
net/bluetooth/l2cap_core.c | 12 ++++++++++++
net/bluetooth/l2cap_sock.c | 13 ++++++++++++-
net/bluetooth/smp.c | 5 +++++
4 files changed, 34 insertions(+), 1 deletion(-)