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cifs: do not fail __smb_send_rqst if non-fatal signals are pending

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RHBZ 1848178

The original intent of returning an error in this function
in the patch:
  "CIFS: Mask off signals when sending SMB packets"
was to avoid interrupting packet send in the middle of
sending the data (and thus breaking an SMB connection),
but we also don't want to fail the request for non-fatal
signals even before we have had a chance to try to
send it (the reported problem could be reproduced e.g.
by exiting a child process when the parent process was in
the midst of calling futimens to update a file's timestamps).

In addition, since the signal may remain pending when we enter the
sending loop, we may end up not sending the whole packet before
TCP buffers become full. In this case the code returns -EINTR
but what we need here is to return -ERESTARTSYS instead to
allow system calls to be restarted.

Fixes: b30c74c73c ("CIFS: Mask off signals when sending SMB packets")
Cc: stable@vger.kernel.org # v5.1+
Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2021-01-21 08:22:48 +10:00 committed by Steve French
parent 16a78851e1
commit 214a5ea081
1 changed files with 2 additions and 2 deletions
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4
fs/cifs/transport.c
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@ -338,7 +338,7 @@ __smb_send_rqst(struct TCP_Server_Info *server, int num_rqst,
if (ssocket == NULL)
return -EAGAIN;
if (signal_pending(current)) {
if (fatal_signal_pending(current)) {
cifs_dbg(FYI, "signal pending before send request\n");
return -ERESTARTSYS;
}
@ -429,7 +429,7 @@ unmask:
if (signal_pending(current) && (total_len != send_length)) {
cifs_dbg(FYI, "signal is pending after attempt to send\n");
rc = -EINTR;
rc = -ERESTARTSYS;
}
/* uncork it */