diff options
| author | Sachin Prabhu <sprabhu@redhat.com> | 2017-03-04 02:41:38 +0300 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2017-04-07 16:04:40 +0300 |
| commit | 38bd49064a1ecb67baad33598e3d824448ab11ec (patch) | |
| tree | dd922c0d30ddffd7e0bda9e53ddca5165c1afb84 /fs/cifs/cifssmb.c | |
| parent | 269c930e6698e6afa6d4606bfd241f4497597e79 (diff) | |
| download | linux-38bd49064a1ecb67baad33598e3d824448ab11ec.tar.xz | |
Handle mismatched open calls
A signal can interrupt a SendReceive call which result in incoming
responses to the call being ignored. This is a problem for calls such as
open which results in the successful response being ignored. This
results in an open file resource on the server.
The patch looks into responses which were cancelled after being sent and
in case of successful open closes the open fids.
For this patch, the check is only done in SendReceive2()
RH-bz: 1403319
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Cc: Stable <stable@vger.kernel.org>
Diffstat (limited to 'fs/cifs/cifssmb.c')
| -rw-r--r-- | fs/cifs/cifssmb.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 066950671929..967b92631807 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1400,9 +1400,9 @@ openRetry: * current bigbuf. */ int -cifs_discard_remaining_data(struct TCP_Server_Info *server) +cifs_discard_remaining_data(struct TCP_Server_Info *server, char *buf) { - unsigned int rfclen = get_rfc1002_length(server->smallbuf); + unsigned int rfclen = get_rfc1002_length(buf); int remaining = rfclen + 4 - server->total_read; while (remaining > 0) { @@ -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 = cifs_discard_remaining_data(server); + length = cifs_discard_remaining_data(server, mid->resp_buf); 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)) { - cifs_discard_remaining_data(server); + cifs_discard_remaining_data(server, buf); return -1; } @@ -1519,6 +1519,9 @@ 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) { |