linux-kernel - [PATCH 1/2] UML - Fix recvmsg return value checking

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Date:	Mon, 12 Nov 2007 10:45:43 -0500
From:	Jeff Dike <jdike@...toit.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	uml-devel <user-mode-linux-devel@...ts.sourceforge.net>
Subject: [PATCH 1/2] UML - Fix recvmsg return value checking

Stupid bug - we need to compare the return value of recvmsg to the
value of iov_len, not its size.  This caused port_helper processes not
to be killed on shutdown on x86_64 because the pids weren't being
passed out properly.

Signed-off-by: Jeff Dike <jdike@...ux.intel.com>
---
 arch/um/os-Linux/file.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Index: linux-2.6/arch/um/os-Linux/file.c
===================================================================
--- linux-2.6.orig/arch/um/os-Linux/file.c	2007-11-12 10:26:26.000000000 -0500
+++ linux-2.6/arch/um/os-Linux/file.c	2007-11-12 10:32:30.000000000 -0500
@@ -496,8 +496,7 @@ int os_rcv_fd(int fd, int *helper_pid_ou
 	n = recvmsg(fd, &msg, 0);
 	if(n < 0)
 		return -errno;
-
-	else if(n != sizeof(iov.iov_len))
+	else if(n != iov.iov_len)
 		*helper_pid_out = -1;
 
 	cmsg = CMSG_FIRSTHDR(&msg);
-
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