Xiaoli Feng <fengxiaoli0714@xxxxxxxxx> writes: > Test the latest kernel in the branch for-next of > git://git.samba.org/sfrench/cifs-2.6.git. Kernel always panic when > mount cifs with option "-o sec=krb5,multiuser". > > Bug 216878 - CIFS: kernel BUG at mm/slub.c:435 > https://bugzilla.kernel.org/show_bug.cgi?id=216878 Thanks for the report. I wasn't able to reproduce it but the issue seems related to sesInfoFree() calling kfree_sensitive() again in cifs_ses::auth_key.response even though it was kfree_sensitive()'d earlier in SMB2_auth_kerberos(). Does below changes fix your issue? Thanks. diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 2c484d47c592..727f16b426be 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -1482,8 +1482,11 @@ SMB2_auth_kerberos(struct SMB2_sess_data *sess_data) out_put_spnego_key: key_invalidate(spnego_key); key_put(spnego_key); - if (rc) + if (rc) { kfree_sensitive(ses->auth_key.response); + ses->auth_key.response = NULL; + ses->auth_key.len = 0; + } out: sess_data->result = rc; sess_data->func = NULL;
