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CIFS: Add capability to decrypt big read responses

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Allow to decrypt transformed packets that are bigger than the big
buffer size. In particular it is used for read responses that can
only exceed the big buffer size.

Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
This commit is contained in:
Pavel Shilovsky
2016-11-17 16:20:23 -08:00
committed by Steve French
parent 4326ed2f6a
commit c42a6abe30
3 changed files with 169 additions and 13 deletions
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8
fs/cifs/cifssmb.c
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@@ -1399,8 +1399,8 @@ openRetry:
* Discard any remaining data in the current SMB. To do this, we borrow the
* current bigbuf.
*/
static int
discard_remaining_data(struct TCP_Server_Info *server)
int
cifs_discard_remaining_data(struct TCP_Server_Info *server)
{
unsigned int rfclen = get_rfc1002_length(server->smallbuf);
int remaining = rfclen + 4 - server->total_read;
@@ -1426,7 +1426,7 @@ 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);
length = cifs_discard_remaining_data(server);
dequeue_mid(mid, rdata->result);
return length;
}
@@ -1459,7 +1459,7 @@ 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)) {
discard_remaining_data(server);
cifs_discard_remaining_data(server);
return -1;
}