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| author | Pavel Begunkov <asml.silence@gmail.com> | 2021-07-19 11:53:00 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-08-24 08:04:58 -0600 |
| commit | d9cf3bd531844ffbfe94b16e417037a16efc988d (patch) | |
| tree | 3f67cd309c9508be5de6a84c06621fa44fdc67c1 /block | |
| parent | c4b2b7d150d2b155b317b3e2f66492c6befab2b5 (diff) | |
| download | linux-d9cf3bd531844ffbfe94b16e417037a16efc988d.tar.bz2 | |
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.c | 15 |
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; } |