[PATCH v5 09/24] netfs: Fix overrun check in netfs_extract_user_iter()

David Howells
2026-04-28T13:19:28Z

Fix netfs_extract_user_iter() so that if iov_iter_extract_pages() overfills
pages[], then those pages don't get included in the iterator constructed at
the end of the function. If there was an overfill, memory corruption has
already happened.

Fixes: 85dd2c8ff368 ("netfs: Add a function to extract a UBUF or IOVEC into a BVEC iterator")
Closes: https://sashiko.dev/#/patchset/20260427154639.180684-1-dhowells%40redhat.com
Signed-off-by: David Howells <dhowells@redhat.com>
cc: Paulo Alcantara <pc@manguebit.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
---
fs/netfs/iterator.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)

diff --git a/fs/netfs/iterator.c b/fs/netfs/iterator.c
index adca78747f23..932f745fa3b5 100644
--- a/fs/netfs/iterator.c
+++ b/fs/netfs/iterator.c
@@ -72,21 +72,24 @@ ssize_t netfs_extract_user_iter(struct iov_iter *orig, size_t orig_len,
break;
}

- if (ret > count) {
- pr_err("get_pages rc=%zd more than %zu\n", ret, count);
+ if (WARN(ret > count,
+ "%s: extract_pages overrun %zd > %zu bytes\n",
+ __func__, ret, count)) {
+ ret = -EIO;
break;
}

- count -= ret;
- ret += offset;
- cur_npages = DIV_ROUND_UP(ret, PAGE_SIZE);
-
- if (npages + cur_npages > max_pages) {
- pr_err("Out of bvec array capacity (%u vs %u)\n",
- npages + cur_npages, max_pages);
+ cur_npages = DIV_ROUND_UP(offset + ret, PAGE_SIZE);
+ if (WARN(cur_npages > max_pages - npages,
+ "%s: extract_pages overrun %u > %u pages\n",
+ __func__, npages + cur_npages, max_pages)) {
+ ret = -EIO;
break;
}

+ count -= ret;
+ ret += offset;
+
for (i = 0; i < cur_npages; i++) {
len = ret > PAGE_SIZE ? PAGE_SIZE : ret;
bvec_set_page(bv + npages + i, *pages++, len - offset, offset);