OSS-Fuzz: Add fuzzer for ssh channels handling

Signed-off-by: Arthur Chan <arthur.chan@adalogics.com>

Author: arthurscchan

regress/misc/fuzz-harness/Makefile

@@ -14,7 +14,8 @@ COMMON_DEPS=../../../libssh.a $(COMMON_OBJS)
 
 TARGETS=pubkey_fuzz sig_fuzz authopt_fuzz authkeys_fuzz sshsig_fuzz \
 	sshsigopt_fuzz privkey_fuzz kex_fuzz agent_fuzz \
-	mkcorpus_sntrup761 sntrup761_enc_fuzz sntrup761_dec_fuzz
+	mkcorpus_sntrup761 sntrup761_enc_fuzz sntrup761_dec_fuzz \
+	ssh_channels_fuzz
 
 all: $(TARGETS)
 
@@ -65,6 +66,9 @@ sntrup761_dec_fuzz: sntrup761_dec_fuzz.o
 sntrup761_enc_fuzz: sntrup761_enc_fuzz.o
 	$(CXX) -o $@ sntrup761_enc_fuzz.o $(LDFLAGS) $(FUZZ_FLAGS) $(FUZZ_LIBS) -lcrypto
 
+ssh_channels_fuzz: ssh_channels_fuzz.o $(SK_NULL_OBJS) $(COMMON_DEPS)
+	$(CXX) -o $@ ssh_channels_fuzz.o $(SK_NULL_OBJS) -Wl,--wrap=ssh_packet_disconnect,--wrap=sshpkt_fatal $(LDFLAGS) $(FUZZ_FLAGS) $(LIBS) -lz
+
 clean:
 	-rm -f *.o $(TARGETS)