Hi, Greg.
The followup to 985b67cd86392310d9e9326de941c22fc9340eec, that I submitted in the same thread, has not been picked up.
20260108150350.3354622-2-cascardo@igalia.com https://lore.kernel.org/stable/20260108150350.3354622-2-cascardo@igalia.com/ a2187431c395 ("ext4: fix error message when rejecting the default hash")
You picked it up for 6.1 and 5.15 though.
Regards. Cascardo.
On Fri, Jan 09, 2026 at 12:44:30PM +0100, Greg Kroah-Hartman wrote:
6.6-stable review patch. If anyone has any objections, please let me know.
From: Lizhi Xu lizhi.xu@windriver.com
commit 985b67cd86392310d9e9326de941c22fc9340eec upstream.
When mounting the ext4 filesystem, if the default hash version is set to DX_HASH_SIPHASH but the casefold feature is not set, exit the mounting.
Reported-by: syzbot+340581ba9dceb7e06fb3@syzkaller.appspotmail.com Signed-off-by: Lizhi Xu lizhi.xu@windriver.com Link: https://patch.msgid.link/20240605012335.44086-1-lizhi.xu@windriver.com Signed-off-by: Theodore Ts'o tytso@mit.edu [cascardo: small conflict fixup] Signed-off-by: Thadeu Lima de Souza Cascardo cascardo@igalia.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
fs/ext4/super.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3632,6 +3632,14 @@ int ext4_feature_set_ok(struct super_blo } #endif
- if (EXT4_SB(sb)->s_es->s_def_hash_version == DX_HASH_SIPHASH &&
!ext4_has_feature_casefold(sb)) {ext4_msg(sb, KERN_ERR,"Filesystem without casefold feature cannot be ""mounted with siphash");return 0;- }
- if (readonly) return 1;