Re: [syzbot] [gfs2?] general protection fault in gfs2_remove_from_journal (2)

[Qing Wang]

#syz test

diff --git a/fs/gfs2/meta_io.c b/fs/gfs2/meta_io.c
index e4356198d8d8..f459ad89b641 100644
--- a/fs/gfs2/meta_io.c
+++ b/fs/gfs2/meta_io.c
@@ -350,11 +350,13 @@ void gfs2_remove_from_journal(struct buffer_head *bh, int meta)
 		trace_gfs2_pin(bd, 0);
 		atomic_dec(&sdp->sd_log_pinned);
 		list_del_init(&bd->bd_list);
-		if (meta == REMOVE_META)
-			tr->tr_num_buf_rm++;
-		else
-			tr->tr_num_databuf_rm++;
-		set_bit(TR_TOUCHED, &tr->tr_flags);
+		if (tr) {
+			if (meta == REMOVE_META)
+				tr->tr_num_buf_rm++;
+			else
+				tr->tr_num_databuf_rm++;
+			set_bit(TR_TOUCHED, &tr->tr_flags);
+		}
 		was_pinned = 1;
 		brelse(bh);
 	}