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[Qemu-devel] [PATCH 1/2] slirp: Don't crash on packets from 0.0.0.0/8.
From: |
Jan Kiszka |
Subject: |
[Qemu-devel] [PATCH 1/2] slirp: Don't crash on packets from 0.0.0.0/8. |
Date: |
Mon, 19 Nov 2012 15:14:31 +0100 |
From: Nickolai Zeldovich <address@hidden>
LWIP can generate packets with a source of 0.0.0.0, which triggers an
assertion failure in arp_table_add(). Instead of crashing, simply return
to avoid adding an invalid ARP table entry.
Signed-off-by: Nickolai Zeldovich <address@hidden>
Signed-off-by: Jan Kiszka <address@hidden>
---
slirp/arp_table.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/slirp/arp_table.c b/slirp/arp_table.c
index 5d7b8ac..bf698c1 100644
--- a/slirp/arp_table.c
+++ b/slirp/arp_table.c
@@ -38,7 +38,9 @@ void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t
ethaddr[ETH_ALEN])
ethaddr[3], ethaddr[4], ethaddr[5]));
/* Check 0.0.0.0/8 invalid source-only addresses */
- assert((ip_addr & htonl(~(0xf << 28))) != 0);
+ if ((ip_addr & htonl(~(0xf << 28))) == 0) {
+ return;
+ }
if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
/* Do not register broadcast addresses */
--
1.7.3.4