[LTS 9.4] CVE-2024-41049, CVE-2024-42301, CVE-2024-46858, CVE-2025-21727, CVE-2025-21887

drivers/parport/procfs.c

@@ -51,12 +51,12 @@ static int do_active_device(struct ctl_table *table, int write,
 
 	for (dev = port->devices; dev ; dev = dev->next) {
 		if(dev == port->cad) {
-			len += sprintf(buffer, "%s\n", dev->name);
+			len += scnprintf(buffer, sizeof(buffer), "%s\n", dev->name);
 		}
 	}
 
 	if(!len) {
-		len += sprintf(buffer, "%s\n", "none");
+		len += scnprintf(buffer, sizeof(buffer), "%s\n", "none");
 	}
 
 	if (len > *lenp)
@@ -87,19 +87,19 @@ static int do_autoprobe(struct ctl_table *table, int write,
 	}
 
 	if ((str = info->class_name) != NULL)
-		len += sprintf (buffer + len, "CLASS:%s;\n", str);
+		len += scnprintf (buffer + len, sizeof(buffer) - len, "CLASS:%s;\n", str);
 
 	if ((str = info->model) != NULL)
-		len += sprintf (buffer + len, "MODEL:%s;\n", str);
+		len += scnprintf (buffer + len, sizeof(buffer) - len, "MODEL:%s;\n", str);
 
 	if ((str = info->mfr) != NULL)
-		len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
+		len += scnprintf (buffer + len, sizeof(buffer) - len, "MANUFACTURER:%s;\n", str);
 
 	if ((str = info->description) != NULL)
-		len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
+		len += scnprintf (buffer + len, sizeof(buffer) - len, "DESCRIPTION:%s;\n", str);
 
 	if ((str = info->cmdset) != NULL)
-		len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
+		len += scnprintf (buffer + len, sizeof(buffer) - len, "COMMAND SET:%s;\n", str);
 
 	if (len > *lenp)
 		len = *lenp;
@@ -117,7 +117,7 @@ static int do_hardware_base_addr(struct ctl_table *table, int write,
 				 void *result, size_t *lenp, loff_t *ppos)
 {
 	struct parport *port = (struct parport *)table->extra1;
-	char buffer[20];
+	char buffer[64];
 	int len = 0;
 
 	if (*ppos) {
@@ -128,7 +128,7 @@ static int do_hardware_base_addr(struct ctl_table *table, int write,
 	if (write) /* permissions prevent this anyway */
 		return -EACCES;
 
-	len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
+	len += scnprintf (buffer, sizeof(buffer), "%lu\t%lu\n", port->base, port->base_hi);
 
 	if (len > *lenp)
 		len = *lenp;
@@ -155,7 +155,7 @@ static int do_hardware_irq(struct ctl_table *table, int write,
 	if (write) /* permissions prevent this anyway */
 		return -EACCES;
 
-	len += sprintf (buffer, "%d\n", port->irq);
+	len += scnprintf (buffer, sizeof(buffer), "%d\n", port->irq);
 
 	if (len > *lenp)
 		len = *lenp;
@@ -182,7 +182,7 @@ static int do_hardware_dma(struct ctl_table *table, int write,
 	if (write) /* permissions prevent this anyway */
 		return -EACCES;
 
-	len += sprintf (buffer, "%d\n", port->dma);
+	len += scnprintf (buffer, sizeof(buffer), "%d\n", port->dma);
 
 	if (len > *lenp)
 		len = *lenp;
@@ -213,7 +213,7 @@ static int do_hardware_modes(struct ctl_table *table, int write,
 #define printmode(x)							\
 do {									\
 	if (port->modes & PARPORT_MODE_##x)				\
-		len += sprintf(buffer + len, "%s%s", f++ ? "," : "", #x); \
+		len += scnprintf(buffer + len, sizeof(buffer) - len, "%s%s", f++ ? "," : "", #x); \
 } while (0)
 		int f = 0;
 		printmode(PCSPP);

fs/locks.c

@@ -1298,9 +1298,9 @@ static int posix_lock_inode(struct inode *inode, struct file_lock *request,
 		locks_wake_up_blocks(left);
 	}
  out:
+	trace_posix_lock_inode(inode, request, error);
 	spin_unlock(&ctx->flc_lock);
 	percpu_up_read(&file_rwsem);
-	trace_posix_lock_inode(inode, request, error);
 	/*
 	 * Free any unused locks.
 	 */

fs/overlayfs/copy_up.c

@@ -532,14 +532,14 @@ static int ovl_link_up(struct ovl_copy_up_ctx *c)
 	err = PTR_ERR(upper);
 	if (!IS_ERR(upper)) {
 		err = ovl_do_link(ofs, ovl_dentry_upper(c->dentry), udir, upper);
-		dput(upper);
 
 		if (!err) {
 			/* Restore timestamps on parent (best effort) */
 			ovl_set_timestamps(ofs, upperdir, &c->pstat);
 			ovl_dentry_set_upper_alias(c->dentry);
 			ovl_dentry_update_reval(c->dentry, upper);
 		}
+		dput(upper);
 	}
 	inode_unlock(udir);
 	if (err)

kernel/padata.c

@@ -1112,6 +1112,12 @@ void padata_free_shell(struct padata_shell *ps)
 	if (!ps)
 		return;
 
+	/*
+	 * Wait for all _do_serial calls to finish to avoid touching
+	 * freed pd's and ps's.
+	 */
+	synchronize_rcu();
+
 	mutex_lock(&ps->pinst->lock);
 	list_del(&ps->list);
 	pd = rcu_dereference_protected(ps->pd, 1);

net/mptcp/pm_netlink.c

@@ -328,15 +328,21 @@ mptcp_pm_del_add_timer(struct mptcp_sock *msk,
 {
 	struct mptcp_pm_add_entry *entry;
 	struct sock *sk = (struct sock *)msk;
+	struct timer_list *add_timer = NULL;
 
 	spin_lock_bh(&msk->pm.lock);
 	entry = mptcp_lookup_anno_list_by_saddr(msk, addr);
-	if (entry && (!check_id || entry->addr.id == addr->id))
+	if (entry && (!check_id || entry->addr.id == addr->id)) {
 		entry->retrans_times = ADD_ADDR_RETRANS_MAX;
+		add_timer = &entry->add_timer;
+	}
+	if (!check_id && entry)
+		list_del(&entry->list);
 	spin_unlock_bh(&msk->pm.lock);
 
-	if (entry && (!check_id || entry->addr.id == addr->id))
-		sk_stop_timer_sync(sk, &entry->add_timer);
+	/* no lock, because sk_stop_timer_sync() is calling del_timer_sync() */
+	if (add_timer)
+		sk_stop_timer_sync(sk, add_timer);
 
 	return entry;
 }
@@ -1360,7 +1366,6 @@ static bool remove_anno_list_by_saddr(struct mptcp_sock *msk,
 
 	entry = mptcp_pm_del_add_timer(msk, addr, false);
 	if (entry) {
-		list_del(&entry->list);
 		kfree(entry);
 		return true;
 	}