linux-kernel - [PATCH 3/5] fs: f2fs: initialize fsdata in pagecache

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Message-ID: <20221121112134.407362-3-glider@google.com>
Date:   Mon, 21 Nov 2022 12:21:32 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     glider@...gle.com
Cc:     linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org,
        chao@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net,
        Eric Biggers <ebiggers@...nel.org>
Subject: [PATCH 3/5] fs: f2fs: initialize fsdata in pagecache_write()

When aops->write_begin() does not initialize fsdata, KMSAN may report
an error passing the latter to aops->write_end().

Fix this by unconditionally initializing fsdata.

Suggested-by: Eric Biggers <ebiggers@...nel.org>
Fixes: 95ae251fe828 ("f2fs: add fs-verity support")
Signed-off-by: Alexander Potapenko <glider@...gle.com>
---
 fs/f2fs/verity.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index c352fff88a5e6..3f4f3295f1c66 100644
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -81,7 +81,7 @@ static int pagecache_write(struct inode *inode, const void *buf, size_t count,
 		size_t n = min_t(size_t, count,
 				 PAGE_SIZE - offset_in_page(pos));
 		struct page *page;
-		void *fsdata;
+		void *fsdata = NULL;
 		int res;
 
 		res = aops->write_begin(NULL, mapping, pos, n, &page, &fsdata);
-- 
2.38.1.584.g0f3c55d4c2-goog