6.6-stable review patch. If anyone has any objections, please let me know.
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From: Paulo Alcantara pc@manguebit.com
commit 69ccf040acddf33a3a85ec0f6b45ef84b0f7ec29 upstream.
Skip sessions that are being teared down (status == SES_EXITING) to avoid UAF.
Cc: stable@vger.kernel.org Signed-off-by: Paulo Alcantara (Red Hat) pc@manguebit.com Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/smb/client/misc.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/smb/client/misc.c +++ b/fs/smb/client/misc.c @@ -489,6 +489,8 @@ is_valid_oplock_break(char *buffer, stru /* look up tcon based on tid & uid */ spin_lock(&cifs_tcp_ses_lock); list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) { + if (cifs_ses_exiting(ses)) + continue; list_for_each_entry(tcon, &ses->tcon_list, tcon_list) { if (tcon->tid != buf->Tid) continue;