From 86a7964be7afaf3df6b64faaa10a7032d2444e51 Mon Sep 17 00:00:00 2001 From: Pavel Shilovsky Date: Thu, 21 Nov 2019 11:35:13 -0800 Subject: CIFS: Fix NULL pointer dereference in mid callback There is a race between a system call processing thread and the demultiplex thread when mid->resp_buf becomes NULL and later is being accessed to get credits. It happens when the 1st thread wakes up before a mid callback is called in the 2nd one but the mid state has already been set to MID_RESPONSE_RECEIVED. This causes NULL pointer dereference in mid callback. Fix this by saving credits from the response before we update the mid state and then use this value in the mid callback rather then accessing a response buffer. Cc: Stable Fixes: ee258d79159afed5 ("CIFS: Move credit processing to mid callbacks for SMB3") Tested-by: Frank Sorenson Reviewed-by: Ronnie Sahlberg Signed-off-by: Pavel Shilovsky Signed-off-by: Steve French --- fs/cifs/smb2ops.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) (limited to 'fs/cifs/smb2ops.c') diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index f28d4207bbda..eb92cd4502cc 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -151,13 +151,7 @@ smb2_get_credits_field(struct TCP_Server_Info *server, const int optype) static unsigned int smb2_get_credits(struct mid_q_entry *mid) { - struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)mid->resp_buf; - - if (mid->mid_state == MID_RESPONSE_RECEIVED - || mid->mid_state == MID_RESPONSE_MALFORMED) - return le16_to_cpu(shdr->CreditRequest); - - return 0; + return mid->credits_received; } static int -- cgit v1.2.3