Re: slab-out-of-bounds access in bio_integrity_alloc()

On 8/20/21 4:58 PM, Bart Van Assche wrote:

Hi,

It's been a while since I ran blktests. If I run it against Jens' for-next
branch (39916d4054e7 ("Merge branch 'for-5.15/io_uring' into for-next")) a
slab-out-of-bounds access complaint appears. Is anyone already looking into
this?

Does this help?

diff --git a/block/bio.c b/block/bio.c
index ae9085b97deb..94a0c01465a8 100644
--- a/block/bio.c
+++ b/block/bio.c

@@ -282,8 +282,9 @@ void bio_init(struct bio *bio, struct bio_vec *table,
 	atomic_set(&bio->__bi_remaining, 1);
 	atomic_set(&bio->__bi_cnt, 1);
 
-	bio->bi_io_vec = table;
 	bio->bi_max_vecs = max_vecs;
+	bio->bi_io_vec = table;
+	bio->bi_pool = NULL;
 }
 EXPORT_SYMBOL(bio_init);
 

-- 
Jens Axboe