fs: f2fs: initialize fsdata in pagecache_write()

[ Upstream commit b1b9896718bc1a212dc288ad66a5fa2fef11353d ]

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: 95ae251fe828 ("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 26e7154168291eeabbb874fc1a35aba607eaee96..d5a50e73ec32b79b3ad20c1c87d07cd84366a7da 100644 (file)
--- a/fs/f2fs/verity.c
+++ b/fs/f2fs/verity.c
@@ -78,7 +78,7 @@ 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 = pagecache_write_begin(NULL, inode->i_mapping, pos, n, 0,