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H A D | xattr.c | 1e81d6c3 Thu Jun 13 10:02:34 CDT 2024 Jan Kara <jack@suse.cz> ext4: avoid writing unitialized memory to disk in EA inodes
[ Upstream commit 65121eff3e4c8c90f8126debf3c369228691c591 ]
If the extended attribute size is not a multiple of block size, the last block in the EA inode will have uninitialized tail which will get written to disk. We will never expose the data to userspace but still this is not a good practice so just zero out the tail of the block as it isn't going to cause a noticeable performance overhead.
Fixes: e50e5129f384 ("ext4: xattr-in-inode support") Reported-by: syzbot+9c1fe13fcb51574b249b@syzkaller.appspotmail.com Reported-by: Hugh Dickins <hughd@google.com> Signed-off-by: Jan Kara <jack@suse.cz> Link: https://patch.msgid.link/20240613150234.25176-1-jack@suse.cz Signed-off-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Sasha Levin <sashal@kernel.org>
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