[PATCH 4.9 078/107] fuse: Fix oops at process_init_reply()

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Miklos Szeredi <mszeredi@xxxxxxxxxx>

commit e8f3bd773d22f488724dffb886a1618da85c2966 upstream.

syzbot is hitting NULL pointer dereference at process_init_reply().
This is because deactivate_locked_super() is called before response for
initial request is processed.

Fix this by aborting and waiting for all requests (including FUSE_INIT)
before resetting fc->sb.

Original patch by Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>.

Reported-by: syzbot <syzbot+b62f08f4d5857755e3bc@xxxxxxxxxxxxxxxxxxxxxxxxx>
Fixes: e27c9d3877a0 ("fuse: fuse: add time_gran to INIT_OUT")
Cc: <stable@xxxxxxxxxxxxxxx> # v3.19
Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 fs/fuse/inode.c |   25 +++++++++++--------------
 1 file changed, 11 insertions(+), 14 deletions(-)

--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -402,11 +402,6 @@ static void fuse_put_super(struct super_
 {
 	struct fuse_conn *fc = get_fuse_conn_super(sb);
 
-	fuse_send_destroy(fc);
-
-	fuse_abort_conn(fc);
-	fuse_wait_aborted(fc);
-
 	mutex_lock(&fuse_mutex);
 	list_del(&fc->entry);
 	fuse_ctl_remove_conn(fc);
@@ -1206,16 +1201,25 @@ static struct dentry *fuse_mount(struct
 	return mount_nodev(fs_type, flags, raw_data, fuse_fill_super);
 }
 
-static void fuse_kill_sb_anon(struct super_block *sb)
+static void fuse_sb_destroy(struct super_block *sb)
 {
 	struct fuse_conn *fc = get_fuse_conn_super(sb);
 
 	if (fc) {
+		fuse_send_destroy(fc);
+
+		fuse_abort_conn(fc);
+		fuse_wait_aborted(fc);
+
 		down_write(&fc->killsb);
 		fc->sb = NULL;
 		up_write(&fc->killsb);
 	}
+}
 
+static void fuse_kill_sb_anon(struct super_block *sb)
+{
+	fuse_sb_destroy(sb);
 	kill_anon_super(sb);
 }
 
@@ -1238,14 +1242,7 @@ static struct dentry *fuse_mount_blk(str
 
 static void fuse_kill_sb_blk(struct super_block *sb)
 {
-	struct fuse_conn *fc = get_fuse_conn_super(sb);
-
-	if (fc) {
-		down_write(&fc->killsb);
-		fc->sb = NULL;
-		up_write(&fc->killsb);
-	}
-
+	fuse_sb_destroy(sb);
 	kill_block_super(sb);
 }