+ fs-hfsplus-initialize-fsdata-in-hfsplus_file_truncate.patch added to mm-nonmm-unstable branch

+ fs-hfsplus-initialize-fsdata-in-hfsplus_file_truncate.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: fs: hfsplus: initialize fsdata in hfsplus_file_truncate()
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     fs-hfsplus-initialize-fsdata-in-hfsplus_file_truncate.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fs-hfsplus-initialize-fsdata-in-hfsplus_file_truncate.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Alexander Potapenko <glider@google.com>
Subject: fs: hfsplus: initialize fsdata in hfsplus_file_truncate()
Date: Mon, 21 Nov 2022 12:21:34 +0100

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.

Link: https://lkml.kernel.org/r/20221121112134.407362-5-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Suggested-by: Eric Biggers <ebiggers@kernel.org>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Chao Yu <chao@kernel.org>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/hfsplus/extents.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/hfsplus/extents.c~fs-hfsplus-initialize-fsdata-in-hfsplus_file_truncate
+++ a/fs/hfsplus/extents.c
@@ -554,7 +554,7 @@ void hfsplus_file_truncate(struct inode
 	if (inode->i_size > hip->phys_size) {
 		struct address_space *mapping = inode->i_mapping;
 		struct page *page;
-		void *fsdata;
+		void *fsdata = NULL;
 		loff_t size = inode->i_size;
 
 		res = hfsplus_write_begin(NULL, mapping, size, 0,
_

Patches currently in -mm which might be from glider@google.com are

revert-x86-kmsan-sync-metadata-pages-on-page-fault.patch
kmsan-silence-wmissing-prototypes-warnings.patch
fs-hfs-initialize-fsdata-in-hfs_file_truncate.patch
fs-hfsplus-initialize-fsdata-in-hfsplus_file_truncate.patch