[LTS 9.6] CVE-2025-38248, CVE-2025-39933, CVE-2025-38730, CVE-2025-38415

fs/smb/client/smbdirect.c

@@ -446,7 +446,9 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
 	struct smbd_response *response =
 		container_of(wc->wr_cqe, struct smbd_response, cqe);
 	struct smbd_connection *info = response->info;
-	int data_length = 0;
+	u32 data_offset = 0;
+	u32 data_length = 0;
+	u32 remaining_data_length = 0;
 
 	log_rdma_recv(INFO, "response=0x%p type=%d wc status=%d wc opcode %d byte_len=%d pkey_index=%u\n",
 		      response, response->type, wc->status, wc->opcode,
@@ -478,7 +480,22 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
 	/* SMBD data transfer packet */
 	case SMBD_TRANSFER_DATA:
 		data_transfer = smbd_response_payload(response);
+
+		if (wc->byte_len <
+		    offsetof(struct smbd_data_transfer, padding))
+			goto error;
+
+		remaining_data_length = le32_to_cpu(data_transfer->remaining_data_length);
+		data_offset = le32_to_cpu(data_transfer->data_offset);
 		data_length = le32_to_cpu(data_transfer->data_length);
+		if (wc->byte_len < data_offset ||
+		    (u64)wc->byte_len < (u64)data_offset + data_length)
+			goto error;
+
+		if (remaining_data_length > info->max_fragmented_recv_size ||
+		    data_length > info->max_fragmented_recv_size ||
+		    (u64)remaining_data_length + (u64)data_length > (u64)info->max_fragmented_recv_size)
+			goto error;
 
 		/*
 		 * If this is a packet with data playload place the data in

fs/squashfs/super.c

@@ -142,10 +142,15 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 	unsigned short flags;
 	unsigned int fragments;
 	u64 lookup_table_start, xattr_id_table_start, next_table;
-	int err;
+	int err, devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);
 
 	TRACE("Entered squashfs_fill_superblock\n");
 
+	if (!devblksize) {
+		errorf(fc, "squashfs: unable to set blocksize\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * squashfs provides 'backing_dev_info' in order to disable read-ahead. For
 	 * squashfs, I/O is not deferred, it is done immediately in read_folio,
@@ -169,7 +174,7 @@ static int squashfs_fill_super(struct super_block *sb, struct fs_context *fc)
 
 	msblk->panic_on_errors = (opts->errors == Opt_errors_panic);
 
-	msblk->devblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);
+	msblk->devblksize = devblksize;
 	msblk->devblksize_log2 = ffz(~msblk->devblksize);
 
 	mutex_init(&msblk->meta_index_mutex);

io_uring/kbuf.c

@@ -171,9 +171,8 @@ static void __user *io_ring_buffer_select(struct io_kiocb *req, size_t *len,
 		 * the transfer completes (or if we get -EAGAIN and must poll of
 		 * retry).
 		 */
-		req->flags &= ~REQ_F_BUFFERS_COMMIT;
+		io_kbuf_commit(req, bl, 1);
 		req->buf_list = NULL;
-		bl->head++;
 	}
 	return u64_to_user_ptr(buf->addr);
 }
@@ -297,8 +296,8 @@ int io_buffers_select(struct io_kiocb *req, struct buf_sel_arg *arg,
 		 * committed them, they cannot be put back in the queue.
 		 */
 		if (ret > 0) {
-			req->flags |= REQ_F_BL_NO_RECYCLE;
-			req->buf_list->head += ret;
+			req->flags |= REQ_F_BUFFERS_COMMIT | REQ_F_BL_NO_RECYCLE;
+			io_kbuf_commit(req, bl, ret);
 		}
 	} else {
 		ret = io_provided_buffers_select(req, &arg->out_len, bl, arg->iovs);

io_uring/kbuf.h

@@ -117,15 +117,21 @@ static inline bool io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags)
 	return false;
 }
 
+static inline void io_kbuf_commit(struct io_kiocb *req,
+				  struct io_buffer_list *bl, int nr)
+{
+	if (unlikely(!(req->flags & REQ_F_BUFFERS_COMMIT)))
+		return;
+	bl->head += nr;
+	req->flags &= ~REQ_F_BUFFERS_COMMIT;
+}
+
 static inline void __io_put_kbuf_ring(struct io_kiocb *req, int nr)
 {
 	struct io_buffer_list *bl = req->buf_list;
 
 	if (bl) {
-		if (req->flags & REQ_F_BUFFERS_COMMIT) {
-			bl->head += nr;
-			req->flags &= ~REQ_F_BUFFERS_COMMIT;
-		}
+		io_kbuf_commit(req, bl, nr);
 		req->buf_index = bl->bgid;
 	}
 	req->flags &= ~REQ_F_BUFFER_RING;

io_uring/net.c

@@ -478,6 +478,15 @@ static int io_bundle_nbufs(struct io_async_msghdr *kmsg, int ret)
 	return nbufs;
 }
 
+static int io_net_kbuf_recyle(struct io_kiocb *req,
+			      struct io_async_msghdr *kmsg, int len)
+{
+	req->flags |= REQ_F_BL_NO_RECYCLE;
+	if (req->flags & REQ_F_BUFFERS_COMMIT)
+		io_kbuf_commit(req, req->buf_list, io_bundle_nbufs(kmsg, len));
+	return -EAGAIN;
+}
+
 static inline bool io_send_finish(struct io_kiocb *req, int *ret,
 				  struct io_async_msghdr *kmsg,
 				  unsigned issue_flags)
@@ -546,8 +555,7 @@ int io_sendmsg(struct io_kiocb *req, unsigned int issue_flags)
 			kmsg->msg.msg_controllen = 0;
 			kmsg->msg.msg_control = NULL;
 			sr->done_io += ret;
-			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return -EAGAIN;
+			return io_net_kbuf_recyle(req, kmsg, ret);
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -635,8 +643,7 @@ int io_send(struct io_kiocb *req, unsigned int issue_flags)
 			sr->len -= ret;
 			sr->buf += ret;
 			sr->done_io += ret;
-			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return -EAGAIN;
+			return io_net_kbuf_recyle(req, kmsg, ret);
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -1018,8 +1025,7 @@ int io_recvmsg(struct io_kiocb *req, unsigned int issue_flags)
 		}
 		if (ret > 0 && io_net_retry(sock, flags)) {
 			sr->done_io += ret;
-			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return -EAGAIN;
+			return io_net_kbuf_recyle(req, kmsg, ret);
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -1158,8 +1164,7 @@ int io_recv(struct io_kiocb *req, unsigned int issue_flags)
 			sr->len -= ret;
 			sr->buf += ret;
 			sr->done_io += ret;
-			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return -EAGAIN;
+			return io_net_kbuf_recyle(req, kmsg, ret);
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -1395,8 +1400,7 @@ int io_send_zc(struct io_kiocb *req, unsigned int issue_flags)
 			zc->len -= ret;
 			zc->buf += ret;
 			zc->done_io += ret;
-			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return -EAGAIN;
+			return io_net_kbuf_recyle(req, kmsg, ret);
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;
@@ -1455,8 +1459,7 @@ int io_sendmsg_zc(struct io_kiocb *req, unsigned int issue_flags)
 
 		if (ret > 0 && io_net_retry(sock, flags)) {
 			sr->done_io += ret;
-			req->flags |= REQ_F_BL_NO_RECYCLE;
-			return -EAGAIN;
+			return io_net_kbuf_recyle(req, kmsg, ret);
 		}
 		if (ret == -ERESTARTSYS)
 			ret = -EINTR;

net/bridge/br_mst.c

@@ -80,10 +80,10 @@ static void br_mst_vlan_set_state(struct net_bridge_vlan_group *vg,
 	if (br_vlan_get_state(v) == state)
 		return;
 
-	br_vlan_set_state(v, state);
-
 	if (v->vid == vg->pvid)
 		br_vlan_set_pvid_state(vg, state);
+
+	br_vlan_set_state(v, state);
 }
 
 int br_mst_set_state(struct net_bridge_port *p, u16 msti, u8 state,

net/bridge/br_multicast.c

@@ -2014,10 +2014,19 @@ void br_multicast_port_ctx_init(struct net_bridge_port *port,
 
 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx)
 {
+	struct net_bridge *br = pmctx->port->br;
+	bool del = false;
+
 #if IS_ENABLED(CONFIG_IPV6)
 	del_timer_sync(&pmctx->ip6_mc_router_timer);
 #endif
 	del_timer_sync(&pmctx->ip4_mc_router_timer);
+
+	spin_lock_bh(&br->multicast_lock);
+	del |= br_ip6_multicast_rport_del(pmctx);
+	del |= br_ip4_multicast_rport_del(pmctx);
+	br_multicast_rport_del_notify(pmctx, del);
+	spin_unlock_bh(&br->multicast_lock);
 }
 
 int br_multicast_add_port(struct net_bridge_port *port)
@@ -2105,12 +2114,17 @@ static void __br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
 	}
 }
 
-void br_multicast_enable_port(struct net_bridge_port *port)
+static void br_multicast_enable_port_ctx(struct net_bridge_mcast_port *pmctx)
 {
-	struct net_bridge *br = port->br;
+	struct net_bridge *br = pmctx->port->br;
 
 	spin_lock_bh(&br->multicast_lock);
-	__br_multicast_enable_port_ctx(&port->multicast_ctx);
+	if (br_multicast_port_ctx_is_vlan(pmctx) &&
+	    !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) {
+		spin_unlock_bh(&br->multicast_lock);
+		return;
+	}
+	__br_multicast_enable_port_ctx(pmctx);
 	spin_unlock_bh(&br->multicast_lock);
 }
 
@@ -2137,11 +2151,67 @@ static void __br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
 	br_multicast_rport_del_notify(pmctx, del);
 }
 
+static void br_multicast_disable_port_ctx(struct net_bridge_mcast_port *pmctx)
+{
+	struct net_bridge *br = pmctx->port->br;
+
+	spin_lock_bh(&br->multicast_lock);
+	if (br_multicast_port_ctx_is_vlan(pmctx) &&
+	    !(pmctx->vlan->priv_flags & BR_VLFLAG_MCAST_ENABLED)) {
+		spin_unlock_bh(&br->multicast_lock);
+		return;
+	}
+
+	__br_multicast_disable_port_ctx(pmctx);
+	spin_unlock_bh(&br->multicast_lock);
+}
+
+static void br_multicast_toggle_port(struct net_bridge_port *port, bool on)
+{
+#if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
+	if (br_opt_get(port->br, BROPT_MCAST_VLAN_SNOOPING_ENABLED)) {
+		struct net_bridge_vlan_group *vg;
+		struct net_bridge_vlan *vlan;
+
+		rcu_read_lock();
+		vg = nbp_vlan_group_rcu(port);
+		if (!vg) {
+			rcu_read_unlock();
+			return;
+		}
+
+		/* iterate each vlan, toggle vlan multicast context */
+		list_for_each_entry_rcu(vlan, &vg->vlan_list, vlist) {
+			struct net_bridge_mcast_port *pmctx =
+						&vlan->port_mcast_ctx;
+			u8 state = br_vlan_get_state(vlan);
+			/* enable vlan multicast context when state is
+			 * LEARNING or FORWARDING
+			 */
+			if (on && br_vlan_state_allowed(state, true))
+				br_multicast_enable_port_ctx(pmctx);
+			else
+				br_multicast_disable_port_ctx(pmctx);
+		}
+		rcu_read_unlock();
+		return;
+	}
+#endif
+	/* toggle port multicast context when vlan snooping is disabled */
+	if (on)
+		br_multicast_enable_port_ctx(&port->multicast_ctx);
+	else
+		br_multicast_disable_port_ctx(&port->multicast_ctx);
+}
+
+void br_multicast_enable_port(struct net_bridge_port *port)
+{
+	br_multicast_toggle_port(port, true);
+}
+
 void br_multicast_disable_port(struct net_bridge_port *port)
 {
-	spin_lock_bh(&port->br->multicast_lock);
-	__br_multicast_disable_port_ctx(&port->multicast_ctx);
-	spin_unlock_bh(&port->br->multicast_lock);
+	br_multicast_toggle_port(port, false);
 }
 
 static int __grp_src_delete_marked(struct net_bridge_port_group *pg)
@@ -4211,6 +4281,32 @@ static void __br_multicast_stop(struct net_bridge_mcast *brmctx)
 #endif
 }
 
+void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state)
+{
+#if IS_ENABLED(CONFIG_BRIDGE_VLAN_FILTERING)
+	struct net_bridge *br;
+
+	if (!br_vlan_should_use(v))
+		return;
+
+	if (br_vlan_is_master(v))
+		return;
+
+	br = v->port->br;
+
+	if (!br_opt_get(br, BROPT_MCAST_VLAN_SNOOPING_ENABLED))
+		return;
+
+	if (br_vlan_state_allowed(state, true))
+		br_multicast_enable_port_ctx(&v->port_mcast_ctx);
+
+	/* Multicast is not disabled for the vlan when it goes in
+	 * blocking state because the timers will expire and stop by
+	 * themselves without sending more queries.
+	 */
+#endif
+}
+
 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on)
 {
 	struct net_bridge *br;
@@ -4304,9 +4400,9 @@ int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
 		__br_multicast_open(&br->multicast_ctx);
 	list_for_each_entry(p, &br->port_list, list) {
 		if (on)
-			br_multicast_disable_port(p);
+			br_multicast_disable_port_ctx(&p->multicast_ctx);
 		else
-			br_multicast_enable_port(p);
+			br_multicast_enable_port_ctx(&p->multicast_ctx);
 	}
 
 	list_for_each_entry(vlan, &vg->vlan_list, vlist)

net/bridge/br_private.h

@@ -1052,6 +1052,7 @@ void br_multicast_port_ctx_init(struct net_bridge_port *port,
 				struct net_bridge_vlan *vlan,
 				struct net_bridge_mcast_port *pmctx);
 void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pmctx);
+void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v, u8 state);
 void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan, bool on);
 int br_multicast_toggle_vlan_snooping(struct net_bridge *br, bool on,
 				      struct netlink_ext_ack *extack);
@@ -1502,6 +1503,11 @@ static inline void br_multicast_port_ctx_deinit(struct net_bridge_mcast_port *pm
 {
 }
 
+static inline void br_multicast_update_vlan_mcast_ctx(struct net_bridge_vlan *v,
+						      u8 state)
+{
+}
+
 static inline void br_multicast_toggle_one_vlan(struct net_bridge_vlan *vlan,
 						bool on)
 {
@@ -1852,7 +1858,9 @@ bool br_vlan_global_opts_can_enter_range(const struct net_bridge_vlan *v_curr,
 bool br_vlan_global_opts_fill(struct sk_buff *skb, u16 vid, u16 vid_range,
 			      const struct net_bridge_vlan *v_opts);
 
-/* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
+/* vlan state manipulation helpers using *_ONCE to annotate lock-free access,
+ * while br_vlan_set_state() may access data protected by multicast_lock.
+ */
 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
 {
 	return READ_ONCE(v->state);
@@ -1861,6 +1869,7 @@ static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
 {
 	WRITE_ONCE(v->state, state);
+	br_multicast_update_vlan_mcast_ctx(v, state);
 }
 
 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)