The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x b8fc56fbca7482c1e5c0e3351c6ae78982e25ada # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024110908-basin-unrefined-82bf@gregkh' --subject-prefix 'PATCH 5.15.y' HEAD^..

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b8fc56fbca7482c1e5c0e3351c6ae78982e25ada Mon Sep 17 00:00:00 2001 From: Namjae Jeon linkinjeon@kernel.org Date: Mon, 4 Nov 2024 13:40:41 +0900 Subject: [PATCH] ksmbd: fix slab-use-after-free in smb3_preauth_hash_rsp

ksmbd_user_session_put should be called under smb3_preauth_hash_rsp(). It will avoid freeing session before calling smb3_preauth_hash_rsp().

Cc: stable@vger.kernel.org # v5.15+ Reported-by: Norbert Szetei norbert@doyensec.com Tested-by: Norbert Szetei norbert@doyensec.com Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com

diff --git a/fs/smb/server/server.c b/fs/smb/server/server.c index 9670c97f14b3..e7f14f8df943 100644 --- a/fs/smb/server/server.c +++ b/fs/smb/server/server.c @@ -238,11 +238,11 @@ static void __handle_ksmbd_work(struct ksmbd_work *work, } while (is_chained == true);

send: - if (work->sess) - ksmbd_user_session_put(work->sess); if (work->tcon) ksmbd_tree_connect_put(work->tcon); smb3_preauth_hash_rsp(work); + if (work->sess) + ksmbd_user_session_put(work->sess); if (work->sess && work->sess->enc && work->encrypted && conn->ops->encrypt_resp) { rc = conn->ops->encrypt_resp(work);