The patch titled
Subject: fs: hfs: initialize fsdata in hfs_file_truncate()
has been added to the -mm mm-nonmm-unstable branch. Its filename is
fs-hfs-initialize-fsdata-in-hfs_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-hfs-initialize-fsdata-in-hfs_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@xxxxxxxxxx>
Subject: fs: hfs: initialize fsdata in hfs_file_truncate()
Date: Mon, 21 Nov 2022 12:21:33 +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/20221121112134.407362-4-glider@xxxxxxxxxx
Signed-off-by: Alexander Potapenko <glider@xxxxxxxxxx>
Suggested-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>
Cc: Chao Yu <chao@xxxxxxxxxx>
Cc: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hfs/extent.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/hfs/extent.c~fs-hfs-initialize-fsdata-in-hfs_file_truncate
+++ a/fs/hfs/extent.c
@@ -486,7 +486,7 @@ void hfs_file_truncate(struct inode *ino
inode->i_size);
if (inode->i_size > HFS_I(inode)->phys_size) {
struct address_space *mapping = inode->i_mapping;
- void *fsdata;
+ void *fsdata = NULL;
struct page *page;
/* XXX: Can use generic_cont_expand? */
_
Patches currently in -mm which might be from glider@xxxxxxxxxx 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
