linux-kernel - [PATCH 4/7] iomap: simplify direct io validity check

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250801234736.1913170-5-kbusch@meta.com>
Date: Fri, 1 Aug 2025 16:47:33 -0700
From: Keith Busch <kbusch@...a.com>
To: <linux-block@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC: <snitzer@...nel.org>, <axboe@...nel.dk>, <dw@...idwei.uk>,
        <brauner@...nel.org>, Keith Busch <kbusch@...nel.org>
Subject: [PATCH 4/7] iomap: simplify direct io validity check

From: Keith Busch <kbusch@...nel.org>

The block layer checks all the segments for validity later, so no need
for an early check. Just reduce it to a simple position and total length
and defer the segment checks to the block layer.

Signed-off-by: Keith Busch <kbusch@...nel.org>
---
 fs/iomap/direct-io.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 6f25d4cfea9f7..2c1a45e46dc75 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -337,8 +337,7 @@ static int iomap_dio_bio_iter(struct iomap_iter *iter, struct iomap_dio *dio)
 	u64 copied = 0;
 	size_t orig_count;
 
-	if ((pos | length) & (bdev_logical_block_size(iomap->bdev) - 1) ||
-	    !bdev_iter_is_aligned(iomap->bdev, dio->submit.iter))
+	if ((pos | length) & (bdev_logical_block_size(iomap->bdev) - 1))
 		return -EINVAL;
 
 	if (dio->flags & IOMAP_DIO_WRITE) {
-- 
2.47.3