Commit 7835d73f authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Luis Henriques

CIFS: Fix SMB2+ interim response processing for read requests

commit 6cc3b242 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: default avatarPavel Shilovsky <pshilovsky@samba.org>
Tested-by: default avatarShirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
Signed-off-by: default avatarLuis Henriques <luis.henriques@canonical.com>
parent 5182893e
......@@ -1399,11 +1399,10 @@ CIFS_open(const unsigned int xid, struct cifs_open_parms *oparms, int *oplock,
* 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;
......@@ -1417,10 +1416,20 @@ 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)
{
......@@ -1449,6 +1458,12 @@ 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) {
......
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