power: supply: ltc2941-battery-gauge: fix use-after-free

[sagit-ice-cold/kernel_xiaomi_msm8998.git] / block / bio.c

diff --git a/block/bio.c b/block/bio.c
index 63363a6..cf513f7 100644 (file)
--- a/block/bio.c
+++ b/block/bio.c
@@ -1216,8 +1216,11 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
                        }
                }
 
-               if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes)
+               if (bio_add_pc_page(q, bio, page, bytes, offset) < bytes) {
+                       if (!map_data)
+                               __free_page(page);
                        break;
+               }
 
                len -= bytes;
                offset = 0;