This is a note to let you know that I've just added the patch titled
fuse: dax: set fc->dax to NULL in fuse_dax_conn_free()
to the 6.6-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:
fuse-dax-set-fc-dax-to-null-in-fuse_dax_conn_free.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7f8ed28d1401320bcb02dda81b3c23ab2dc5a6d8 Mon Sep 17 00:00:00 2001
From: Hangyu Hua <hbh25y@xxxxxxxxx>
Date: Thu, 16 Nov 2023 15:57:26 +0800
Subject: fuse: dax: set fc->dax to NULL in fuse_dax_conn_free()
From: Hangyu Hua <hbh25y@xxxxxxxxx>
commit 7f8ed28d1401320bcb02dda81b3c23ab2dc5a6d8 upstream.
fuse_dax_conn_free() will be called when fuse_fill_super_common() fails
after fuse_dax_conn_alloc(). Then deactivate_locked_super() in
virtio_fs_get_tree() will call virtio_kill_sb() to release the discarded
superblock. This will call fuse_dax_conn_free() again in fuse_conn_put(),
resulting in a possible double free.
Fixes: 1dd539577c42 ("virtiofs: add a mount option to enable dax")
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
Acked-by: Vivek Goyal <vgoyal@xxxxxxxxxx>
Reviewed-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.10
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/fuse/dax.c | 1 +
1 file changed, 1 insertion(+)
--- a/fs/fuse/dax.c
+++ b/fs/fuse/dax.c
@@ -1222,6 +1222,7 @@ void fuse_dax_conn_free(struct fuse_conn
if (fc->dax) {
fuse_free_dax_mem_ranges(&fc->dax->free_ranges);
kfree(fc->dax);
+ fc->dax = NULL;
}
}
Patches currently in stable-queue which might be from hbh25y@xxxxxxxxx are
queue-6.6/fuse-dax-set-fc-dax-to-null-in-fuse_dax_conn_free.patch
