From 2b2844b10d7b7e5c97f9c667d664d9418bb7769a Mon Sep 17 00:00:00 2001
From: Ludwig Nussel <ludwig.nussel@suse.de>
Date: Wed, 19 May 2010 15:43:44 +0200
Subject: [PATCH] socket: ignore packet if FIONREAD returns zero
zero size is reported for corrupt packets. recvmsg() later could
nevertheless get data from a good packet that followed the bad one.
So get out early to avoid hitting an assertion.
---
avahi-core/socket.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/avahi-core/socket.c b/avahi-core/socket.c
index 4146d5a..f9b90a2 100644
--- a/avahi-core/socket.c
+++ b/avahi-core/socket.c
@@ -652,6 +652,10 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv4(
goto fail;
}
+ /* For corrupt packets FIONREAD returns zero size (See rhbz #607297) */
+ if (!ms)
+ goto fail;
+
p = avahi_dns_packet_new(ms + AVAHI_DNS_PACKET_EXTRA_SIZE);
io.iov_base = AVAHI_DNS_PACKET_DATA(p);
@@ -805,6 +809,10 @@ AvahiDnsPacket *avahi_recv_dns_packet_ipv6(
goto fail;
}
+ /* For corrupt packets FIONREAD returns zero size (See rhbz #607297) */
+ if (!ms)
+ goto fail;
+
p = avahi_dns_packet_new(ms + AVAHI_DNS_PACKET_EXTRA_SIZE);
io.iov_base = AVAHI_DNS_PACKET_DATA(p);
--
1.6.3.3