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[CIFS] In SendReceive, move consistency check out of the mutexed region 

inbuf->smb_buf_length does not change in in wait_for_free_request() or in
allocate_mid(), so we can check it early.

Signed-off-by: Volker Lendecke <vl@samba.org>
Acked-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Volker Lendecke 2008-12-08 20:50:24 +00:00 committed by Steve French
parent 00e485b019
commit 6d9c6d5431
1 changed files with 12 additions and 19 deletions
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31
fs/cifs/transport.c
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@ -687,6 +687,12 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
to the same server. We may make this configurable later or
use ses->maxReq */
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cERROR(1, ("Illegal length, greater than maximum frame, %d",
in_buf->smb_buf_length));
return -EIO;
}
rc = wait_for_free_request(ses, long_op);
if (rc)
return rc;
@ -706,17 +712,6 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
return rc;
}
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cERROR(1, ("Illegal length, greater than maximum frame, %d",
in_buf->smb_buf_length));
DeleteMidQEntry(midQ);
mutex_unlock(&ses->server->srv_mutex);
/* Update # of requests on wire to server */
atomic_dec(&ses->server->inFlight);
wake_up(&ses->server->request_q);
return -EIO;
}
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
midQ->midState = MID_REQUEST_SUBMITTED;
@ -925,6 +920,12 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
to the same server. We may make this configurable later or
use ses->maxReq */
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
cERROR(1, ("Illegal length, greater than maximum frame, %d",
in_buf->smb_buf_length));
return -EIO;
}
rc = wait_for_free_request(ses, CIFS_BLOCKING_OP);
if (rc)
return rc;
@ -941,14 +942,6 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
return rc;
}
if (in_buf->smb_buf_length > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {
mutex_unlock(&ses->server->srv_mutex);
cERROR(1, ("Illegal length, greater than maximum frame, %d",
in_buf->smb_buf_length));
DeleteMidQEntry(midQ);
return -EIO;
}
rc = cifs_sign_smb(in_buf, ses->server, &midQ->sequence_number);
midQ->midState = MID_REQUEST_SUBMITTED;