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authorMing Lei <ming.lei@redhat.com>2019-07-01 15:14:46 +0800
committerJens Axboe <axboe@kernel.dk>2019-07-01 08:18:54 -0600
commit79d08f89bb1b5c2c1ff90d9bb95497ab9e8aa7e0 (patch)
tree9394c85b2fa7022176c9bcfad49fa809dc6a15aa
parent5be1f9d82fa73c199ebeee2866dbac83e419c897 (diff)
downloadlinux-79d08f89bb1b5c2c1ff90d9bb95497ab9e8aa7e0.tar.bz2
block: fix .bi_size overflow
'bio->bi_iter.bi_size' is 'unsigned int', which at most hold 4G - 1 bytes. Before 07173c3ec276 ("block: enable multipage bvecs"), one bio can include very limited pages, and usually at most 256, so the fs bio size won't be bigger than 1M bytes most of times. Since we support multi-page bvec, in theory one fs bio really can be added > 1M pages, especially in case of hugepage, or big writeback with too many dirty pages. Then there is chance in which .bi_size is overflowed. Fixes this issue by using bio_full() to check if the added segment may overflow .bi_size. Cc: Liu Yiding <liuyd.fnst@cn.fujitsu.com> Cc: kernel test robot <rong.a.chen@intel.com> Cc: "Darrick J. Wong" <darrick.wong@oracle.com> Cc: linux-xfs@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org Cc: stable@vger.kernel.org Fixes: 07173c3ec276 ("block: enable multipage bvecs") Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
-rw-r--r--block/bio.c10
-rw-r--r--fs/iomap.c2
-rw-r--r--fs/xfs/xfs_aops.c2
-rw-r--r--include/linux/bio.h18
4 files changed, 23 insertions, 9 deletions
diff --git a/block/bio.c b/block/bio.c
index 933c1e36643b..29cd6cf4da51 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -723,7 +723,7 @@ static int __bio_add_pc_page(struct request_queue *q, struct bio *bio,
}
}
- if (bio_full(bio))
+ if (bio_full(bio, len))
return 0;
if (bio->bi_vcnt >= queue_max_segments(q))
@@ -797,7 +797,7 @@ void __bio_add_page(struct bio *bio, struct page *page,
struct bio_vec *bv = &bio->bi_io_vec[bio->bi_vcnt];
WARN_ON_ONCE(bio_flagged(bio, BIO_CLONED));
- WARN_ON_ONCE(bio_full(bio));
+ WARN_ON_ONCE(bio_full(bio, len));
bv->bv_page = page;
bv->bv_offset = off;
@@ -824,7 +824,7 @@ int bio_add_page(struct bio *bio, struct page *page,
bool same_page = false;
if (!__bio_try_merge_page(bio, page, len, offset, &same_page)) {
- if (bio_full(bio))
+ if (bio_full(bio, len))
return 0;
__bio_add_page(bio, page, len, offset);
}
@@ -909,7 +909,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
if (same_page)
put_page(page);
} else {
- if (WARN_ON_ONCE(bio_full(bio)))
+ if (WARN_ON_ONCE(bio_full(bio, len)))
return -EINVAL;
__bio_add_page(bio, page, len, offset);
}
@@ -953,7 +953,7 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
ret = __bio_iov_bvec_add_pages(bio, iter);
else
ret = __bio_iov_iter_get_pages(bio, iter);
- } while (!ret && iov_iter_count(iter) && !bio_full(bio));
+ } while (!ret && iov_iter_count(iter) && !bio_full(bio, 0));
if (is_bvec)
bio_set_flag(bio, BIO_NO_PAGE_REF);
diff --git a/fs/iomap.c b/fs/iomap.c
index 4f94788db43b..7a147aa0c4d9 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -333,7 +333,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
if (iop)
atomic_inc(&iop->read_count);
- if (!ctx->bio || !is_contig || bio_full(ctx->bio)) {
+ if (!ctx->bio || !is_contig || bio_full(ctx->bio, plen)) {
gfp_t gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
int nr_vecs = (length + PAGE_SIZE - 1) >> PAGE_SHIFT;
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 8da5e6637771..11f703d4a605 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -782,7 +782,7 @@ xfs_add_to_ioend(
atomic_inc(&iop->write_count);
if (!merged) {
- if (bio_full(wpc->ioend->io_bio))
+ if (bio_full(wpc->ioend->io_bio, len))
xfs_chain_bio(wpc->ioend, wbc, bdev, sector);
bio_add_page(wpc->ioend->io_bio, page, len, poff);
}
diff --git a/include/linux/bio.h b/include/linux/bio.h
index dc630b05e6e5..3cdb84cdc488 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -102,9 +102,23 @@ static inline void *bio_data(struct bio *bio)
return NULL;
}
-static inline bool bio_full(struct bio *bio)
+/**
+ * bio_full - check if the bio is full
+ * @bio: bio to check
+ * @len: length of one segment to be added
+ *
+ * Return true if @bio is full and one segment with @len bytes can't be
+ * added to the bio, otherwise return false
+ */
+static inline bool bio_full(struct bio *bio, unsigned len)
{
- return bio->bi_vcnt >= bio->bi_max_vecs;
+ if (bio->bi_vcnt >= bio->bi_max_vecs)
+ return true;
+
+ if (bio->bi_iter.bi_size > UINT_MAX - len)
+ return true;
+
+ return false;
}
static inline bool bio_next_segment(const struct bio *bio,