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[PATCH 3.13.y-ckt 19/43] CIFS: Fix SMB2+ interim response processing for read requests

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3.13.11-ckt37 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Pavel Shilovsky <pshilovsky@samba.org>

commit 6cc3b24235929b54acd5ecc987ef11a425bd209e upstream.

For interim responses we only need to parse a header and update
a number credits. Now it is done for all SMB2+ command except
SMB2_READ which is wrong. Fix this by adding such processing.

Signed-off-by: Pavel Shilovsky <pshilovsky@samba.org>
Tested-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
---
 fs/cifs/cifssmb.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index d707edb..440686b 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1379,11 +1379,10 @@ openRetry:
  * current bigbuf.
  */
 static int
-cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
+discard_remaining_data(struct TCP_Server_Info *server)
 {
 	unsigned int rfclen = get_rfc1002_length(server->smallbuf);
 	int remaining = rfclen + 4 - server->total_read;
-	struct cifs_readdata *rdata = mid->callback_data;
 
 	while (remaining > 0) {
 		int length;
@@ -1397,10 +1396,20 @@ cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 		remaining -= length;
 	}
 
-	dequeue_mid(mid, rdata->result);
 	return 0;
 }
 
+static int
+cifs_readv_discard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
+{
+	int length;
+	struct cifs_readdata *rdata = mid->callback_data;
+
+	length = discard_remaining_data(server);
+	dequeue_mid(mid, rdata->result);
+	return length;
+}
+
 int
 cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 {
@@ -1429,6 +1438,12 @@ cifs_readv_receive(struct TCP_Server_Info *server, struct mid_q_entry *mid)
 		return length;
 	server->total_read += length;
 
+	if (server->ops->is_status_pending &&
+	    server->ops->is_status_pending(buf, server, 0)) {
+		discard_remaining_data(server);
+		return -1;
+	}
+
 	/* Was the SMB read successful? */
 	rdata->result = server->ops->map_error(buf, false);
 	if (rdata->result != 0) {
-- 
2.7.0

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[3.13.y-ckt stable] Linux 3.13.11-ckt37 stable review Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:10 +0100
  [PATCH 3.13.y-ckt 38/43] ext4: iterate over buffer heads correctly in move_extent_per_page() Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:10 +0100
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  [PATCH 3.13.y-ckt 34/43] MIPS: traps: Fix SIGFPE information leak from `do_ov' and `do_trap_or_bp' Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:10 +0100
  [PATCH 3.13.y-ckt 18/43] cifs: fix out-of-bounds access in lease parsing Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:20 +0100
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  [PATCH 3.13.y-ckt 22/43] ALSA: hdsp: Fix wrong boolean ctl value accesses Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:20 +0100
  [PATCH 3.13.y-ckt 24/43] ASoC: wm8958: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:20 +0100
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  [PATCH 3.13.y-ckt 19/43] CIFS: Fix SMB2+ interim response processing for read requests Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:20 +0100
  [PATCH 3.13.y-ckt 26/43] ASoC: wm_adsp: Fix enum ctl accesses in a wrong type Kamal Mostafa <kamal@canonical.com> - 2016-03-22 22:20 +0100

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