From: Andreas Gruenbacher <agruenba@redhat.com>
Date: Mon, 9 Dec 2019 20:11:14 +0100
Subject: block: fix "check bi_size overflow before merge"
Git-commit: cc90bc68422318eb8e75b15cd74bc8d538a7df29
Patch-mainline: 5.5-rc2
References: bnc#1151927 5.3.17
This partially reverts commit e3a5d8e386c3fb973fa75f2403622a8f3640ec06.
Commit e3a5d8e386c3 ("check bi_size overflow before merge") adds a bio_full
check to __bio_try_merge_page. This will cause __bio_try_merge_page to fail
when the last bi_io_vec has been reached. Instead, what we want here is only
the bi_size overflow check.
Fixes: e3a5d8e386c3 ("block: check bi_size overflow before merge")
Cc: stable@vger.kernel.org # v5.4+
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
block/bio.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/block/bio.c
+++ b/block/bio.c
@@ -751,10 +751,12 @@ bool __bio_try_merge_page(struct bio *bi
if (WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED)))
return false;
- if (bio->bi_vcnt > 0 && !bio_full(bio, len)) {
+ if (bio->bi_vcnt > 0) {
struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt - 1];
if (page_is_mergeable(bv, page, len, off, same_page)) {
+ if (bio->bi_iter.bi_size > UINT_MAX - len)
+ return false;
bv->bv_len += len;
bio->bi_iter.bi_size += len;
return true;