]> Git Repo - linux.git/commitdiff
smb: client: fix potential UAF in is_valid_oplock_break()
authorPaulo Alcantara <[email protected]>
Tue, 2 Apr 2024 19:34:00 +0000 (16:34 -0300)
committerSteve French <[email protected]>
Wed, 3 Apr 2024 19:44:42 +0000 (14:44 -0500)
Skip sessions that are being teared down (status == SES_EXITING) to
avoid UAF.

Cc: [email protected]
Signed-off-by: Paulo Alcantara (Red Hat) <[email protected]>
Signed-off-by: Steve French <[email protected]>
fs/smb/client/misc.c

index 1ea22b3955a2f46ea95caae43f921af2161cef2e..33ac4f8f5050c416cd2004ee4516756edd3b11d8 100644 (file)
@@ -481,6 +481,8 @@ is_valid_oplock_break(char *buffer, struct TCP_Server_Info *srv)
        /* 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;
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