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authorAndreas Gruenbacher <agruenba@redhat.com>2019-12-09 20:11:14 +0100
committerJens Axboe <axboe@kernel.dk>2019-12-09 22:04:35 -0700
commitcc90bc68422318eb8e75b15cd74bc8d538a7df29 (patch)
tree4d0f4bb1643821a729440b51421ebfb82144916d /block/bio.c
parentdc3ecfc9819a96b2a6700b01443347b01e07a13b (diff)
downloadlinux-cc90bc68422318eb8e75b15cd74bc8d538a7df29.tar.bz2
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/bio.c')
-rw-r--r--block/bio.c4
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;