linux-kernel - [PATCH AUTOSEL 5.4 12/14] iomap: remove the length variable in iomap_seek

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Message-Id: <20210723035813.531837-12-sashal@kernel.org>
Date:   Thu, 22 Jul 2021 23:58:11 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Christoph Hellwig <hch@....de>,
        Leizhen <thunder.leizhen@...wei.com>,
        "Darrick J . Wong" <djwong@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Sasha Levin <sashal@...nel.org>, linux-xfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 12/14] iomap: remove the length variable in iomap_seek_data

From: Christoph Hellwig <hch@....de>

[ Upstream commit 3ac1d426510f97ace05093ae9f2f710d9cbe6215 ]

The length variable is rather pointless given that it can be trivially
deduced from offset and size.  Also the initial calculation can lead
to KASAN warnings.

Signed-off-by: Christoph Hellwig <hch@....de>
Reported-by: Leizhen (ThunderTown) <thunder.leizhen@...wei.com>
Reviewed-by: Darrick J. Wong <djwong@...nel.org>
Signed-off-by: Darrick J. Wong <djwong@...nel.org>
Reviewed-by: Matthew Wilcox (Oracle) <willy@...radead.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 fs/iomap/seek.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/fs/iomap/seek.c b/fs/iomap/seek.c
index c04bad4b2b43..c61b889235b3 100644
--- a/fs/iomap/seek.c
+++ b/fs/iomap/seek.c
@@ -186,27 +186,23 @@ loff_t
 iomap_seek_data(struct inode *inode, loff_t offset, const struct iomap_ops *ops)
 {
 	loff_t size = i_size_read(inode);
-	loff_t length = size - offset;
 	loff_t ret;
 
 	/* Nothing to be found before or beyond the end of the file. */
 	if (offset < 0 || offset >= size)
 		return -ENXIO;
 
-	while (length > 0) {
-		ret = iomap_apply(inode, offset, length, IOMAP_REPORT, ops,
-				  &offset, iomap_seek_data_actor);
+	while (offset < size) {
+		ret = iomap_apply(inode, offset, size - offset, IOMAP_REPORT,
+				  ops, &offset, iomap_seek_data_actor);
 		if (ret < 0)
 			return ret;
 		if (ret == 0)
-			break;
-
+			return offset;
 		offset += ret;
-		length -= ret;
 	}
 
-	if (length <= 0)
-		return -ENXIO;
-	return offset;
+	/* We've reached the end of the file without finding data */
+	return -ENXIO;
 }
 EXPORT_SYMBOL_GPL(iomap_seek_data);
-- 
2.30.2