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SubjectRe: [syzbot] Re: [syzbot] [block?] general protection fault in bio_first_folio
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Subject: Re: [syzbot] [block?] general protection fault in bio_first_folio
Author: eadavis@qq.com

please test general protection fault in bio_first_folio

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git abb240f7a2bd

diff --git a/include/linux/bio.h b/include/linux/bio.h
index ec4db73e5f4e..20ccf5796ea0 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -286,6 +286,7 @@ static inline void bio_first_folio(struct folio_iter *fi, struct bio *bio,
{
struct bio_vec *bvec = bio_first_bvec_all(bio) + i;

+ WARN_ON_ONCE(!bio->bi_vcnt);
fi->folio = page_folio(bvec->bv_page);
fi->offset = bvec->bv_offset +
PAGE_SIZE * (bvec->bv_page - &fi->folio->page);
diff --git a/block/blk-map.c b/block/blk-map.c
index 8584babf3ea0..e2169d67be4b 100644
--- a/block/blk-map.c
+++ b/block/blk-map.c
@@ -275,6 +275,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
if (!iov_iter_count(iter))
return -EINVAL;

+ printk("i: %p, nr: %d, cn: %lld, %s\n", iter, nr_vecs, iov_iter_count(iter), __func__);
bio = blk_rq_map_bio_alloc(rq, nr_vecs, gfp_mask);
if (bio == NULL)
return -ENOMEM;
@@ -298,6 +299,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
nr_vecs, extraction_flags, &offs);
if (unlikely(bytes <= 0)) {
ret = bytes ? bytes : -EFAULT;
+ printk("r: %d, b: %lld, icn: %d, %s\n", ret, bytes, iov_iter_count(iter), __func__);
goto out_unmap;
}

@@ -339,6 +341,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
}

ret = blk_rq_append_bio(rq, bio);
+ printk("b: %p, r: %d, %s\n", bio, ret, __func__);
if (ret)
goto out_unmap;
return 0;

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