net-misc/bird: Fix crash for merge paths

https://bird.network.cz/pipermail/bird-users/2024-December/017986.html

Signed-off-by: Alarig Le Lay <alarig@swordarmor.fr>

metadata/md5-cache/net-misc/bird-3.0.0

@@ -11,4 +11,4 @@ RDEPEND=client? ( sys-libs/ncurses:= sys-libs/readline:= ) filecaps? ( acct-grou
 SLOT=0
 SRC_URI=ftp://bird.network.cz/pub/bird/bird-3.0.0.tar.gz
 _eclasses_=gnuconfig	ddeb9f8caff1b5f71a09c75b7534df79	toolchain-funcs	fa554cc3cff825d21dfe3f24841e29cf	multilib	b2a329026f2e404e9e371097dda47f96	libtool	6b28392a775f807c8be5fc7ec9a605b9	autotools	7d91cc798a8afd8f4e0c6e9587296ebe	fcaps	27152c9e4da035accb14a2d7879744ef
-_md5_=a8a31444cb89022fc4dc3f8a0e42ab88
+_md5_=12cc3ec227c021ad52ded63dd738a74c

net-misc/bird/bird-3.0.0.ebuild

@@ -36,6 +36,10 @@ FILECAPS=(
 	CAP_NET_RAW				usr/sbin/bird
 )
 
+PATCHES=(
+	"${FILESDIR}"/${P}-nest-rt-table.c.patch
+)
+
 src_prepare() {
 	default
 	eautoreconf

net-misc/bird/files/bird-3.0.0-nest-rt-table.c.patch

@@ -0,0 +1,38 @@
+From b6caccfd45fb639b6dd3a8d140d3c5ba4cc79311 Mon Sep 17 00:00:00 2001
+From: Maria Matejka <mq@ucw.cz>
+Date: Thu, 19 Dec 2024 11:00:15 +0100
+Subject: [PATCH] Kernel: Fix crash for merge paths on if no route is in BIRD
+
+There was a missing check for a NULL return value.
+Also fixed an indenting error.
+
+Thanks to Radu Anghel for reporting it:
+https://bird.network.cz/pipermail/bird-users/2024-December/017977.html
+---
+ nest/rt-table.c | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/nest/rt-table.c b/nest/rt-table.c
+index fd8bb50dd..05191d743 100644
+--- a/nest/rt-table.c
++++ b/nest/rt-table.c
+@@ -5265,14 +5265,14 @@ krt_export_net(struct channel *c, const net_addr *a, linpool *lp)
+   if (c->ra_mode == RA_MERGED)
+   {
+     struct rt_export_feed *feed = rt_net_feed(c->table, a, NULL);
+-    if (!feed->count_routes)
++    if (!feed || !feed->count_routes)
+       return NULL;
+ 
+     if (!bmap_test(&c->export_accepted_map, feed->block[0].id))
+       return NULL;
+ 
+     return rt_export_merged(c, feed, lp, 1);
+-    }
++  }
+ 
+   static _Thread_local rte best;
+   best = rt_net_best(c->table, a);
+-- 
+GitLab
+