This is a note to let you know that I've just added the patch titled
fs: Fix uninitialized value issue in from_kuid and from_kgid
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
fs-fix-uninitialized-value-issue-in-from_kuid-and-fr.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b7b31257b0b4b08b77b80fa9e1d171695d377b97
Author: Alessandro Zanni <alessandro.zanni87@xxxxxxxxx>
Date: Thu Oct 17 14:05:51 2024 +0200
fs: Fix uninitialized value issue in from_kuid and from_kgid
[ Upstream commit 15f34347481648a567db67fb473c23befb796af5 ]
ocfs2_setattr() uses attr->ia_mode, attr->ia_uid and attr->ia_gid in
a trace point even though ATTR_MODE, ATTR_UID and ATTR_GID aren't set.
Initialize all fields of newattrs to avoid uninitialized variables, by
checking if ATTR_MODE, ATTR_UID, ATTR_GID are initialized, otherwise 0.
Reported-by: syzbot+6c55f725d1bdc8c52058@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=6c55f725d1bdc8c52058
Signed-off-by: Alessandro Zanni <alessandro.zanni87@xxxxxxxxx>
Link: https://lore.kernel.org/r/20241017120553.55331-1-alessandro.zanni87@xxxxxxxxx
Reviewed-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 3c71c05a0581b..9062002fd56c6 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1143,9 +1143,12 @@ int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
trace_ocfs2_setattr(inode, dentry,
(unsigned long long)OCFS2_I(inode)->ip_blkno,
dentry->d_name.len, dentry->d_name.name,
- attr->ia_valid, attr->ia_mode,
- from_kuid(&init_user_ns, attr->ia_uid),
- from_kgid(&init_user_ns, attr->ia_gid));
+ attr->ia_valid,
+ attr->ia_valid & ATTR_MODE ? attr->ia_mode : 0,
+ attr->ia_valid & ATTR_UID ?
+ from_kuid(&init_user_ns, attr->ia_uid) : 0,
+ attr->ia_valid & ATTR_GID ?
+ from_kgid(&init_user_ns, attr->ia_gid) : 0);
/* ensuring we don't even attempt to truncate a symlink */
if (S_ISLNK(inode->i_mode))
