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| author | Steve French <sfrench@us.ibm.com> | 2008-11-03 21:46:21 +0100 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2008-11-03 21:46:21 +0100 |
| commit | c527c8a7ffa18400c2c1488f7ab5aff5e83f3c8e (patch) | |
| tree | 4f051c90690aa89099d169baa7fdbce2a01cdea1 | |
| parent | Merge git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6 (diff) | |
| download | linux-c527c8a7ffa18400c2c1488f7ab5aff5e83f3c8e.tar.xz linux-c527c8a7ffa18400c2c1488f7ab5aff5e83f3c8e.zip | |
[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: Shirish Pargaonkar <shirishp@us.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
| -rw-r--r-- | fs/cifs/connect.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index e9f9248cb3fe..c682be8f2984 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -417,9 +417,14 @@ incomplete_rcv: 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) { |