From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 22 Jun 2021 13:59:55 +0300
Subject: [PATCH] cifs: fix NULL dereference in smb2_check_message()
Git-commit: 1689b0b554defd5a7863bbd434ae911b8869504a
Patch-mainline: v5.14-rc1
References: bsc#1192606
This code sets "ses" to NULL which will lead to a NULL dereference on
the second iteration through the loop.
Fixes: 85346c17e425 ("cifs: convert list_for_each to entry variant in smb2misc.c")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Enzo Matsumiya <ematsumiya@suse.de>
---
fs/cifs/smb2misc.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index c6bb2ea1983b..668f77108831 100644
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -158,11 +158,10 @@ smb2_check_message(char *buf, unsigned int len, struct TCP_Server_Info *srvr)
list_for_each_entry(ses, &srvr->smb_ses_list, smb_ses_list) {
if (ses->Suid == thdr->SessionId)
break;
-
- ses = NULL;
}
spin_unlock(&cifs_tcp_ses_lock);
- if (ses == NULL) {
+ if (list_entry_is_head(ses, &srvr->smb_ses_list,
+ smb_ses_list)) {
cifs_dbg(VFS, "no decryption - session id not found\n");
return 1;
}
--
2.33.1