From: Namjae Jeon <linkinjeon@kernel.org> stable inclusion from stable-v6.6.107 commit eb0378dde086363046ed3d7db7f126fc3f76fd70 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/8190 CVE: CVE-2025-39942 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=t... -------------------------------- commit 5282491fc49d5614ac6ddcd012e5743eecb6a67c upstream. If data_offset and data_length of smb_direct_data_transfer struct are invalid, out of bounds issue could happen. This patch validate data_offset and data_length field in recv_done. Cc: stable@vger.kernel.org Fixes: 2ea086e35c3d ("ksmbd: add buffer validation for smb direct") Reviewed-by: Stefan Metzmacher <metze@samba.org> Reported-by: Luigino Camastra, Aisle Research <luigino.camastra@aisle.com> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Long Li <leo.lilong@huawei.com> --- fs/smb/server/transport_rdma.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/fs/smb/server/transport_rdma.c b/fs/smb/server/transport_rdma.c index 3e1e892a40d3..0bbb24169d3f 100644 --- a/fs/smb/server/transport_rdma.c +++ b/fs/smb/server/transport_rdma.c @@ -548,7 +548,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc) case SMB_DIRECT_MSG_DATA_TRANSFER: { struct smb_direct_data_transfer *data_transfer = (struct smb_direct_data_transfer *)recvmsg->packet; - unsigned int data_length; + unsigned int data_offset, data_length; int avail_recvmsg_count, receive_credits; if (wc->byte_len < @@ -559,14 +559,15 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc) } data_length = le32_to_cpu(data_transfer->data_length); - if (data_length) { - if (wc->byte_len < sizeof(struct smb_direct_data_transfer) + - (u64)data_length) { - put_recvmsg(t, recvmsg); - smb_direct_disconnect_rdma_connection(t); - return; - } + data_offset = le32_to_cpu(data_transfer->data_offset); + if (wc->byte_len < data_offset || + wc->byte_len < (u64)data_offset + data_length) { + put_recvmsg(t, recvmsg); + smb_direct_disconnect_rdma_connection(t); + return; + } + if (data_length) { if (t->full_packet_received) recvmsg->first_segment = true; -- 2.39.2