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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2019-12-09 22:11:14 +0300 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-12-10 08:04:35 +0300 |
| commit | cc90bc68422318eb8e75b15cd74bc8d538a7df29 (patch) | |
| tree | 4d0f4bb1643821a729440b51421ebfb82144916d /block | |
| parent | dc3ecfc9819a96b2a6700b01443347b01e07a13b (diff) | |
| download | linux-cc90bc68422318eb8e75b15cd74bc8d538a7df29.tar.xz | |
block: fix "check bi_size overflow before merge"
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>
Diffstat (limited to 'block')
| -rw-r--r-- | block/bio.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/bio.c b/block/bio.c index 9d54aa37ce6c..a5d75f6bf4c7 100644 --- a/block/bio.c +++ b/block/bio.c @@ -754,10 +754,12 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page, 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; |