RIP crashing with redistribution

[mwinter-osr]

Tested with stable/3.0 - the issue does NOT exist in stable/2.0

Issue can be reproduced with test from topotest library rip-topo1
(Checkout branch called rip-topo1 to get the test)

RIP redistribution crashes RIPd. Crashdump:

Program terminated with signal SIGABRT, Aborted.
#0  0x00007f1940692428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
#0  0x00007f1940692428 in __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:54
#1  0x00007f194069402a in __GI_abort () at abort.c:89
#2  0x00007f1940a6b6b8 in core_handler (signo=<optimized out>, siginfo=<optimized out>, context=<optimized out>) at sigevent.c:243
#3  <signal handler called>
#4  0x000055f21f437f57 in rip_redistribute_type (self=<optimized out>, vty=0x55f21ffbf430, argc=<optimized out>, argv=0x55f21ffbe100) at rip_zebra.c:342
#5  0x00007f1940a4d437 in cmd_execute_command_real (vline=vline@entry=0x55f21ffbc710, vty=vty@entry=0x55f21ffbf430, cmd=cmd@entry=0x0, filter=FILTER_STRICT) at command.c:1137
#6  0x00007f1940a4eb6c in cmd_execute_command_strict (vline=vline@entry=0x55f21ffbc710, vty=vty@entry=0x55f21ffbf430, cmd=cmd@entry=0x0) at command.c:1232
#7  0x00007f1940a4ebab in command_config_read_one_line (vty=vty@entry=0x55f21ffbf430, cmd=cmd@entry=0x0, use_daemon=use_daemon@entry=0) at command.c:1261
#8  0x00007f1940a4ecc2 in config_from_file (vty=vty@entry=0x55f21ffbf430, fp=fp@entry=0x55f21ff85b10, line_num=line_num@entry=0x7ffe8e20c7b4) at command.c:1312
#9  0x00007f1940a459c3 in vty_read_file (confp=0x55f21ff85b10) at vty.c:2325
#10 vty_read_config (config_file=<optimized out>, config_default_dir=config_default_dir@entry=0x55f21f647100 <config_default> "/etc/frr//ripd.conf") at vty.c:2510
#11 0x00007f1940a76655 in frr_config_fork () at libfrr.c:368
#12 0x000055f21f431c30 in main (argc=1, argv=0x7ffe8e20d9a8) at rip_main.c:189

[rwestphal]

Should be fixed by #352.