[PATCH 1/2] CIFS: Fix null pointer deref during read resp processing

[Thadeu Lima de Souza Cascardo]

From: Pavel Shilovsky <pshilov at microsoft.com>

BugLink: https://bugs.launchpad.net/bugs/1704857

Currently during receiving a read response mid->resp_buf can be
NULL when it is being passed to cifs_discard_remaining_data() from
cifs_readv_discard(). Fix it by always passing server->smallbuf
instead and initializing mid->resp_buf at the end of read response
processing.

Signed-off-by: Pavel Shilovsky <pshilov at microsoft.com>
CC: Stable <stable at vger.kernel.org>
Acked-by: Sachin Prabhu <sprabhu at redhat.com>
Signed-off-by: Steve French <smfrench at gmail.com>
(cherry picked from commit 350be257ea83029daee974c72b1fe2e6f1f8e615)
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo at canonical.com>
---
 fs/cifs/cifsproto.h |  3 +--
 fs/cifs/cifssmb.c   | 15 ++++++++-------
 fs/cifs/smb2ops.c   |  4 ++--
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 64518f3194be..b0e8c9076061 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -76,8 +76,7 @@ extern void cifs_delete_mid(struct mid_q_entry *mid);
 extern void cifs_wake_up_task(struct mid_q_entry *mid);
 extern int cifs_handle_standard(struct TCP_Server_Info *server,
 				struct mid_q_entry *mid);
-extern int cifs_discard_remaining_data(struct TCP_Server_Info *server,
-				       char *buf);
+extern int cifs_discard_remaining_data(struct TCP_Server_Info *server);
 extern int cifs_call_async(struct TCP_Server_Info *server,
 			struct smb_rqst *rqst,
 			mid_receive_t *receive, mid_callback_t *callback,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 6a9f3fb21801..de35dbd5aabf 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1404,9 +1404,9 @@ openRetry:
  * current bigbuf.
  */
 int
-cifs_discard_remaining_data(struct TCP_Server_Info *server, char *buf)
+cifs_discard_remaining_data(struct TCP_Server_Info *server)
 {
-	unsigned int rfclen = get_rfc1002_length(buf);
+	unsigned int rfclen = get_rfc1002_length(server->smallbuf);
 	int remaining = rfclen + 4 - server->total_read;
 
 	while (remaining > 0) {
@@ -1430,8 +1430,10 @@ cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 	int length;
 	struct cifs_readdata *rdata = mid->callback_data;
 
-	length = cifs_discard_remaining_data(server, mid->resp_buf);
+	length = cifs_discard_remaining_data(server);
 	dequeue_mid(mid, rdata->result);
+	mid->resp_buf = server->smallbuf;
+	server->smallbuf = NULL;
 	return length;
 }
 
@@ -1463,7 +1465,7 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 
 	if (server->ops->is_status_pending &&
 	    server->ops->is_status_pending(buf, server, 0)) {
-		cifs_discard_remaining_data(server, buf);
+		cifs_discard_remaining_data(server);
 		return -1;
 	}
 
@@ -1523,9 +1525,6 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 	cifs_dbg(FYI, "0: iov_base=%p iov_len=%u\n",
 		 rdata->iov[0].iov_base, server->total_read);
 
-	mid->resp_buf = server->smallbuf;
-	server->smallbuf = NULL;
-
 	/* how much data is in the response? */
 	data_len = server->ops->read_data_length(buf);
 	if (data_offset + data_len > buflen) {
@@ -1548,6 +1547,8 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 		return cifs_readv_discard(server, mid);
 
 	dequeue_mid(mid, false);
+	mid->resp_buf = server->smallbuf;
+	server->smallbuf = NULL;
 	return length;
 }
 
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index aac124064deb..b0eb89eddad6 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -2037,7 +2037,7 @@ receive_encrypted_read(struct TCP_Server_Info *server, struct mid_q_entry **mid)
 	if (rc)
 		goto free_pages;
 
-	rc = cifs_discard_remaining_data(server, buf);
+	rc = cifs_discard_remaining_data(server);
 	if (rc)
 		goto free_pages;
 
@@ -2063,7 +2063,7 @@ free_pages:
 	kfree(pages);
 	return rc;
 discard_data:
-	cifs_discard_remaining_data(server, buf);
+	cifs_discard_remaining_data(server);
 	goto free_pages;
 }
 
-- 
2.11.0