From 4c16e1cadcbcaf3c82d5fc310fbd34d0f5d0db7c Mon Sep 17 00:00:00 2001 From: Wentao Liang Date: Mon, 23 Dec 2024 23:30:50 +0800 Subject: ksmbd: fix a missing return value check bug In the smb2_send_interim_resp(), if ksmbd_alloc_work_struct() fails to allocate a node, it returns a NULL pointer to the in_work pointer. This can lead to an illegal memory write of in_work->response_buf when allocate_interim_rsp_buf() attempts to perform a kzalloc() on it. To address this issue, incorporating a check for the return value of ksmbd_alloc_work_struct() ensures that the function returns immediately upon allocation failure, thereby preventing the aforementioned illegal memory access. Fixes: 041bba4414cd ("ksmbd: fix wrong interim response on compound") Signed-off-by: Wentao Liang Acked-by: Namjae Jeon Signed-off-by: Steve French --- fs/smb/server/smb2pdu.c | 3 +++ 1 file changed, 3 insertions(+) (limited to 'fs') diff --git a/fs/smb/server/smb2pdu.c b/fs/smb/server/smb2pdu.c index 23e21845f928..433e33c04039 100644 --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -695,6 +695,9 @@ void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status) struct smb2_hdr *rsp_hdr; struct ksmbd_work *in_work = ksmbd_alloc_work_struct(); + if (!in_work) + return; + if (allocate_interim_rsp_buf(in_work)) { pr_err("smb_allocate_rsp_buf failed!\n"); ksmbd_free_work_struct(in_work); -- cgit v1.2.3