nx_to_ofp_flow_update_event() aborts the execution if incorrect
event is passed, so checking has to be done before conversion
in order to avoid the crash while decoding malformed flow update
message:
==397030==ERROR: AddressSanitizer: ABRT on unknown address 0x... )
0 0x7fd26688418b in raise
1 0x7fd266863858 in abort
2 0x6a6cbd in nx_to_ofp_flow_update_event lib/ofp-monitor.c:399:9
3 0x6a6cbd in ofputil_decode_flow_update lib/ofp-monitor.c:856:25
4 0x56491d in ofp_print_flow_monitor_reply lib/ofp-print.c:779:22
5 0x55f0a0 in ofp_to_string__ lib/ofp-print.c:1154:16
6 0x55f0a0 in ofp_to_string lib/ofp-print.c:1244:21
7 0x5603a5 in ofp_print lib/ofp-print.c:1288:28
Credit to OSS-Fuzz.
Additionally removed the extra 'reply' word from the error message,
since ofpraw_get_name(raw) already has one.
Fixes: c3e64047d1cc ("ofp-monitor: Support flow monitoring for OpenFlow 1.3, 1.4+.")
Reported-at: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=47112
Acked-by: Aaron Conole <aconole@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
While decoding RAW_ENCAP action, decode_ed_prop() might re-allocate
ofpbuf if there is no enough space left. However, function
'decode_NXAST_RAW_ENCAP' continues to use old pointer to 'encap'
structure leading to write-after-free and incorrect decoding.
==3549105==ERROR: AddressSanitizer: heap-use-after-free on address
0x60600000011a at pc 0x0000005f6cc6 bp 0x7ffc3a2d4410 sp 0x7ffc3a2d4408
WRITE of size 2 at 0x60600000011a thread T0
#0 0x5f6cc5 in decode_NXAST_RAW_ENCAP lib/ofp-actions.c:4461:20
#1 0x5f0551 in ofpact_decode ./lib/ofp-actions.inc2:4777:16
#2 0x5ed17c in ofpacts_decode lib/ofp-actions.c:7752:21
#3 0x5eba9a in ofpacts_pull_openflow_actions__ lib/ofp-actions.c:7791:13
#4 0x5eb9fc in ofpacts_pull_openflow_actions lib/ofp-actions.c:7835:12
#5 0x64bb8b in ofputil_decode_packet_out lib/ofp-packet.c:1113:17
#6 0x65b6f4 in ofp_print_packet_out lib/ofp-print.c:148:13
#7 0x659e3f in ofp_to_string__ lib/ofp-print.c:1029:16
#8 0x659b24 in ofp_to_string lib/ofp-print.c:1244:21
#9 0x65a28c in ofp_print lib/ofp-print.c:1288:28
#10 0x540d11 in ofctl_ofp_parse utilities/ovs-ofctl.c:2814:9
#11 0x564228 in ovs_cmdl_run_command__ lib/command-line.c:247:17
#12 0x56408a in ovs_cmdl_run_command lib/command-line.c:278:5
#13 0x5391ae in main utilities/ovs-ofctl.c:179:9
#14 0x7f6911ce9081 in __libc_start_main (/lib64/libc.so.6+0x27081)
#15 0x461fed in _start (utilities/ovs-ofctl+0x461fed)
Fix that by getting a new pointer before using.
Credit to OSS-Fuzz.
Fuzzer regression test will fail only with AddressSanitizer enabled.
Reported-at: https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=27851
Fixes: f839892a206a ("OF support and translation of generic encap and decap")
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
This will make it harder for bugs found by oss-fuzz to reappear.
Signed-off-by: Ben Pfaff <blp@ovn.org>
Tested-by: Yifeng Sun <pkusunyifeng@gmail.com>
Reviewed-by: Yifeng Sun <pkusunyifeng@gmail.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>
