From: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx> [ Upstream commit 985b67cd86392310d9e9326de941c22fc9340eec ] 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@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Lizhi Xu <lizhi.xu@xxxxxxxxxxxxx> Link: https://patch.msgid.link/20240605012335.44086-1-lizhi.xu@xxxxxxxxxxxxx Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Signed-off-by: Vasiliy Kovalev <kovalev@xxxxxxxxxxxx> --- fs/ext4/super.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/fs/ext4/super.c b/fs/ext4/super.c index cf2c8cf507780..68070b1859803 100644 --- a/fs/ext4/super.c +++ b/fs/ext4/super.c @@ -3559,6 +3559,14 @@ int ext4_feature_set_ok(struct super_block *sb, int readonly) } #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; -- 2.33.8
