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authorPavel Begunkov <asml.silence@gmail.com>2021-07-19 13:53:00 +0300
committerJens Axboe <axboe@kernel.dk>2021-08-24 17:04:58 +0300
commitd9cf3bd531844ffbfe94b16e417037a16efc988d (patch)
tree3f67cd309c9508be5de6a84c06621fa44fdc67c1 /block
parentc4b2b7d150d2b155b317b3e2f66492c6befab2b5 (diff)
downloadlinux-d9cf3bd531844ffbfe94b16e417037a16efc988d.tar.xz
bio: fix page leak bio_add_hw_page failure
__bio_iov_append_get_pages() doesn't put not appended pages on bio_add_hw_page() failure, so potentially leaking them, fix it. Also, do the same for __bio_iov_iter_get_pages(), even though it looks like it can't be triggered by userspace in this case. Fixes: 0512a75b98f8 ("block: Introduce REQ_OP_ZONE_APPEND") Cc: stable@vger.kernel.org # 5.8+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/1edfa6a2ffd66d55e6345a477df5387d2c1415d0.1626653825.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/bio.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/block/bio.c b/block/bio.c
index 0c89fa2f7a85..265bff6b549a 100644
--- a/block/bio.c
+++ b/block/bio.c
@@ -974,6 +974,14 @@ static int bio_iov_bvec_set_append(struct bio *bio, struct iov_iter *iter)
return 0;
}
+static void bio_put_pages(struct page **pages, size_t size, size_t off)
+{
+ size_t i, nr = DIV_ROUND_UP(size + (off & ~PAGE_MASK), PAGE_SIZE);
+
+ for (i = 0; i < nr; i++)
+ put_page(pages[i]);
+}
+
#define PAGE_PTRS_PER_BVEC (sizeof(struct bio_vec) / sizeof(struct page *))
/**
@@ -1018,8 +1026,10 @@ 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, len)))
- return -EINVAL;
+ if (WARN_ON_ONCE(bio_full(bio, len))) {
+ bio_put_pages(pages + i, left, offset);
+ return -EINVAL;
+ }
__bio_add_page(bio, page, len, offset);
}
offset = 0;
@@ -1064,6 +1074,7 @@ static int __bio_iov_append_get_pages(struct bio *bio, struct iov_iter *iter)
len = min_t(size_t, PAGE_SIZE - offset, left);
if (bio_add_hw_page(q, bio, page, len, offset,
max_append_sectors, &same_page) != len) {
+ bio_put_pages(pages + i, left, offset);
ret = -EINVAL;
break;
}