Patch "tty: pcn_uart: fix memory leak with using debugfs_lookup()" has been added to the 6.2-stable tree

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This is a note to let you know that I've just added the patch titled

    tty: pcn_uart: fix memory leak with using debugfs_lookup()

to the 6.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tty-pcn_uart-fix-memory-leak-with-using-debugfs_look.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit d554aff9825aa45a6074afc20d5d7a68272e59e4
Author: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Date:   Thu Feb 2 15:12:21 2023 +0100

    tty: pcn_uart: fix memory leak with using debugfs_lookup()
    
    [ Upstream commit 04a189c720aa2b6091442113ce9b9bc93552dff8 ]
    
    When calling debugfs_lookup() the result must have dput() called on it,
    otherwise the memory will leak over time.  To make things simpler, just
    call debugfs_lookup_and_remove() instead which handles all of the logic
    at once.
    
    Cc: Jiri Slaby <jirislaby@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20230202141221.2293012-1-gregkh@xxxxxxxxxxxxxxxxxxx
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index 9576ba8bbc40e..cc83b772b7ca9 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1775,7 +1775,7 @@ static void pch_uart_exit_port(struct eg20t_port *priv)
 	char name[32];
 
 	snprintf(name, sizeof(name), "uart%d_regs", priv->port.line);
-	debugfs_remove(debugfs_lookup(name, NULL));
+	debugfs_lookup_and_remove(name, NULL);
 	uart_remove_one_port(&pch_uart_driver, &priv->port);
 	free_page((unsigned long)priv->rxbuf.buf);
 }



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