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Message-Id: <20231116075726.28634-1-hbh25y@gmail.com> Date: Thu, 16 Nov 2023 15:57:26 +0800 From: Hangyu Hua <hbh25y@...il.com> To: miklos@...redi.hu, vgoyal@...hat.com Cc: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, Hangyu Hua <hbh25y@...il.com> Subject: [PATCH] fs: fuse: dax: set fc->dax to NULL in fuse_dax_conn_free() 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@...il.com> --- fs/fuse/dax.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/fuse/dax.c b/fs/fuse/dax.c index 23904a6a9a96..12ef91d170bb 100644 --- a/fs/fuse/dax.c +++ b/fs/fuse/dax.c @@ -1222,6 +1222,7 @@ 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; } } -- 2.34.1
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