bgpd: Check if we have really enough data before doing memcpy for FQDN capability #16213
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…N capability
We advance data pointer (data++), but we do memcpy() with the length that is 1-byte
over, which is technically heap overflow.
```
==411461==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x50600011da1a at pc 0xc4f45a9786f0 bp 0xffffed1e2740 sp 0xffffed1e1f30
READ of size 4 at 0x50600011da1a thread T0
0 0xc4f45a9786ec in __asan_memcpy (/home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/.libs/bgpd+0x3586ec) (BuildId: e794c5f796eee20c8973d7efb9bf5735e54d44cd)
1 0xc4f45abf15f8 in bgp_dynamic_capability_fqdn /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_packet.c:3457:4
2 0xc4f45abdd408 in bgp_capability_msg_parse /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_packet.c:3911:4
3 0xc4f45abdbeb4 in bgp_capability_receive /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_packet.c:3980:9
4 0xc4f45abde2cc in bgp_process_packet /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_packet.c:4109:11
5 0xc4f45a9b6110 in LLVMFuzzerTestOneInput /home/ubuntu/frr-public/frr_public_private-libfuzzer/bgpd/bgp_main.c:582:3
```
Found by fuzzing.
Reported-by: Iggy Frankovic <[email protected]>
Signed-off-by: Donatas Abraitis <[email protected]>
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ton31337
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Jun 25, 2024
bgpd: Check if we have really enough data before doing memcpy for FQDN capability (backport #16213)
riw777
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Jun 25, 2024
bgpd: Check if we have really enough data before doing memcpy for FQDN capability (backport #16213)
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