Patch "splice: fsnotify_access(in), fsnotify_modify(out) on success in tee" has been added to the 6.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

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

    splice: fsnotify_access(in), fsnotify_modify(out) on success in tee

to the 6.4-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:
     splice-fsnotify_access-in-fsnotify_modify-out-on-suc.patch
and it can be found in the queue-6.4 subdirectory.

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



commit 1845ba7da505f983ee19ff0ae77f76cc1d3b35ef
Author: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
Date:   Mon Jul 3 16:42:21 2023 +0200

    splice: fsnotify_access(in), fsnotify_modify(out) on success in tee
    
    [ Upstream commit 576d498e0ac5caff2d9f6312573ab54d98f12d32 ]
    
    Same logic applies here: this can fill up the pipe, and pollers that rely
    on getting IN_MODIFY notifications never wake up.
    
    Fixes: 983652c69199 ("splice: report related fsnotify events")
    Link: https://lore.kernel.org/linux-fsdevel/jbyihkyk5dtaohdwjyivambb2gffyjs3dodpofafnkkunxq7bu@jngkdxx65pux/t/#u
    Link: https://bugs.debian.org/1039488
    Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
    Acked-by: Jan Kara <jack@xxxxxxx>
    Reviewed-by: Amir Goldstein <amir73il@xxxxxxxxx>
    Message-Id: <10d76dd8c85017ae3cd047c9b9a32e26daefdaa2.1688393619.git.nabijaczleweli@xxxxxxxxxxxxxxxxxx>
    Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/splice.c b/fs/splice.c
index c08eb445a1d20..3ae2de263e806 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1815,6 +1815,11 @@ long do_tee(struct file *in, struct file *out, size_t len, unsigned int flags)
 		}
 	}
 
+	if (ret > 0) {
+		fsnotify_access(in);
+		fsnotify_modify(out);
+	}
+
 	return ret;
 }