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UPSTREAM: fuse: dax: set fc->dax to NULL in fuse_dax_conn_free()

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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")
Change-Id: I5aabc81ad4f96078c612f2ec1c9077f21f4ffae4
Signed-off-by: Hangyu Hua <[email protected]>
Acked-by: Vivek Goyal <[email protected]>
Reviewed-by: Jingbo Xu <[email protected]>
Cc: <[email protected]> # v5.10
Signed-off-by: Miklos Szeredi <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Hangyu Hua 2023-11-16 15:57:26 +08:00 • committed by Alexander Martinz
commit 2068b53c6a
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1
fs/fuse/dax.c
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@ -1228,6 +1228,7 @@ void fuse_dax_conn_free(struct fuse_conn *fc)
if (fc->dax) {
fuse_free_dax_mem_ranges(&fc->dax->free_ranges);
kfree(fc->dax);
fc->dax = NULL;
}
}