From: Jérôme Glisse <jglisse@xxxxxxxxxx>
commit a3761c3c91209b58b6f33bf69dd8bb8ec0c9d925 upstream.
When bio_add_pc_page() fails in bio_copy_user_iov() we should free
the page we just allocated otherwise we are leaking it.
Cc: linux-block@xxxxxxxxxxxxxxx
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
Signed-off-by: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
block/bio.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/block/bio.c
+++ b/block/bio.c
@@ -1216,8 +1216,11 @@ struct bio *bio_copy_user_iov(struct req
}
}
- 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;
