fs: f2fs: initialize fsdata in pagecache_write()

[ Upstream commit 785a46ba35f45db4a9c2439610033a7aaf06ffa3 ]

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@kernel.org>
Fixes: 7bfb14a0e46e ("f2fs: add fs-verity support")
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/f2fs/verity.c b/fs/f2fs/verity.c
index c352fff88a5e65e65dbb37f77201197c84161767..3f4f3295f1c66738c793f7ceb0295b561f06aa91 100644 (file)
--- 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);