ipv6/udp: Use the correct variable to determine non-blocking condition

[ Upstream commit 32c90254ed4a0c698caa0794ebb4de63fcc69631 ]

udpv6_recvmsg() function is not using the correct variable to determine
whether or not the socket is in non-blocking operation, this will lead
to unexpected behavior when a UDP checksum error occurs.

Consider a non-blocking udp receive scenario: when udpv6_recvmsg() is
called by sock_common_recvmsg(), MSG_DONTWAIT bit of flags variable in
udpv6_recvmsg() is cleared by "flags & ~MSG_DONTWAIT" in this call:

    err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
                   flags & ~MSG_DONTWAIT, &addr_len);

i.e. with udpv6_recvmsg() getting these values:

	int noblock = flags & MSG_DONTWAIT
	int flags = flags & ~MSG_DONTWAIT

So, when udp checksum error occurs, the execution will go to
csum_copy_err, and then the problem happens:

    csum_copy_err:
            ...............
            if (flags & MSG_DONTWAIT)
                    return -EAGAIN;
            goto try_again;
            ...............

But it will always go to try_again as MSG_DONTWAIT has been cleared
from flags at call time -- only noblock contains the original value
of MSG_DONTWAIT, so the test should be:

            if (noblock)
                    return -EAGAIN;

This is also consistent with what the ipv4/udp code does.

Signed-off-by: Xufeng Zhang <xufeng.zhang@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 97e1214d7ff92c2e711bbde02fb4fcc7a7d52f2a..e49cf67506e8909448d92e443d461ad71aa5505f 100644 (file)
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -445,7 +445,7 @@ csum_copy_err:
        }
        unlock_sock_fast(sk, slow);
 
-       if (flags & MSG_DONTWAIT)
+       if (noblock)
                return -EAGAIN;
        goto try_again;
 }