Commit c527c8a7 authored by Steve French's avatar Steve French

[CIFS] Can't rely on iov length and base when kernel_recvmsg returns error

When retrying kernel_recvmsg, reset iov_base and iov_len.

Note comment from Sridhar: "In the normal path, iov.iov_len is clearly set to 4. But i think you are
running into a case where kernel_recvmsg() is called via 'goto incomplete_rcv'
It happens if the previous call fails with EAGAIN.
If you want to call recvmsg() after EAGAIN failure, you need to reset iov."
Signed-off-by: default avatarShirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: default avatarSteve French <sfrench@us.ibm.com>
parent a75952b7
......@@ -417,9 +417,14 @@ cifs_demultiplex_thread(struct TCP_Server_Info *server)
msleep(1); /* minimum sleep to prevent looping
allowing socket to clear and app threads to set
tcpStatus CifsNeedReconnect if server hung */
if (pdu_length < 4)
if (pdu_length < 4) {
iov.iov_base = (4 - pdu_length) +
(char *)smb_buffer;
iov.iov_len = pdu_length;
smb_msg.msg_control = NULL;
smb_msg.msg_controllen = 0;
goto incomplete_rcv;
else
} else
continue;
} else if (length <= 0) {
if (server->tcpStatus == CifsNew) {
......
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