From: Ignat Korchagin ignat@cloudflare.com

stable inclusion from stable-v6.6.66 commit 6021ccc2471b7b95e29b7cfc7938e042bf56e281 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IBEANI CVE: CVE-2024-56604

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 3945c799f12b8d1f49a3b48369ca494d981ac465 ]

bt_sock_alloc() attaches allocated sk object to the provided sock object. If rfcomm_dlc_alloc() fails, we release the sk object, but leave the dangling pointer in the sock object, which may cause use-after-free.

Fix this by swapping calls to bt_sock_alloc() and rfcomm_dlc_alloc().

Signed-off-by: Ignat Korchagin ignat@cloudflare.com Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Eric Dumazet edumazet@google.com Link: https://patch.msgid.link/20241014153808.51894-4-ignat@cloudflare.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: dinglongwei dinglongwei1@huawei.com --- net/bluetooth/rfcomm/sock.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c index cbff37b32734..c32a2374638b 100644 --- a/net/bluetooth/rfcomm/sock.c +++ b/net/bluetooth/rfcomm/sock.c @@ -274,13 +274,13 @@ static struct sock *rfcomm_sock_alloc(struct net *net, struct socket *sock, struct rfcomm_dlc *d; struct sock *sk;

- sk = bt_sock_alloc(net, sock, &rfcomm_proto, proto, prio, kern); - if (!sk) + d = rfcomm_dlc_alloc(prio); + if (!d) return NULL;

- d = rfcomm_dlc_alloc(prio); - if (!d) { - sk_free(sk); + sk = bt_sock_alloc(net, sock, &rfcomm_proto, proto, prio, kern); + if (!sk) { + rfcomm_dlc_free(d); return NULL; }