affs: initialize fsdata in affs_truncate()

[ Upstream commit eef034ac6690118c88f357b00e2b3239c9d8575d ]

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.

Fixes: f2b6a16eb8f5 ("fs: affs convert to new aops")
Suggested-by: Eric Biggers <ebiggers@kernel.org>
Signed-off-by: Alexander Potapenko <glider@google.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/affs/file.c b/fs/affs/file.c
index 75ebd2b..25d480e 100644 (file)
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -881,7 +881,7 @@ affs_truncate(struct inode *inode)
        if (inode->i_size > AFFS_I(inode)->mmu_private) {
                struct address_space *mapping = inode->i_mapping;
                struct page *page;
-               void *fsdata;
+               void *fsdata = NULL;
                loff_t isize = inode->i_size;
                int res;