ahocorasick: fix mem leaked AC_NODE_T object (ntop#2258)

skipping node at depth = AC_PATTRN_MAX_LENGTH inside    caused this leak
this change avoid this
Fix:
==3162838==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 40 byte(s) in 1 object(s) allocated from:
    0 0x50f072 in malloc (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x50f072) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    1 0x552f20 in malloc_wrapper /root/workspace/ntop/nDPI/fuzz/fuzz_common_code.c:16:31
    2 0x68a0a5 in ndpi_malloc /root/workspace/ntop/nDPI/src/lib/ndpi_memory.c:60:25
    3 0x68a0fd in ndpi_calloc /root/workspace/ntop/nDPI/src/lib/ndpi_memory.c:67:13
    4 0x9c5b3a in node_create /root/workspace/ntop/nDPI/src/lib/third_party/src/ahocorasick.c:802:25
    5 0x9c760e in node_create_next /root/workspace/ntop/nDPI/src/lib/third_party/src/ahocorasick.c:1007:10
    6 0x9c6653 in ac_automata_add /root/workspace/ntop/nDPI/src/lib/third_party/src/ahocorasick.c:255:19
    7 0x5861d0 in ndpi_add_host_risk_mask /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:4573:8
    8 0x590c0e in ndpi_handle_rule /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:4655:11
    9 0x58ffd5 in load_protocols_file_fd /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:5446:8
    10 0x552c60 in LLVMFuzzerTestOneInput /root/workspace/ntop/nDPI/fuzz/fuzz_filecfg_protocols.c:21:3
    11 0x44be94 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x44be94) (Build
Id: 36867732af52eb22433f5e34fe5422a8af281aa6)
    12 0x4334f7 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x4334f7) (BuildId: 3
6867732af52eb22433f5e34fe5422a8af281aa6)
    13 0x4391e1 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x4
391e1) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    14 0x467323 in main (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x467323) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    15 0x7fce386e97e4 in __libc_start_main (/lib64/libc.so.6+0x3a7e4) (BuildId: b81415c1738806b536fb1599d7af2d15bf6a86b7)

Indirect leak of 328 byte(s) in 1 object(s) allocated from:
    0 0x50f072 in malloc (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x50f072) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    1 0x552f20 in malloc_wrapper /root/workspace/ntop/nDPI/fuzz/fuzz_common_code.c:16:31
    2 0x68a0a5 in ndpi_malloc /root/workspace/ntop/nDPI/src/lib/ndpi_memory.c:60:25
    3 0x68a0fd in ndpi_calloc /root/workspace/ntop/nDPI/src/lib/ndpi_memory.c:67:13
    4 0x9da348 in node_resize_mp /root/workspace/ntop/nDPI/src/lib/third_party/src/ahocorasick.c:1027:13
    5 0x9c79d7 in node_register_matchstr /root/workspace/ntop/nDPI/src/lib/third_party/src/ahocorasick.c:1055:30
    6 0x9c6f21 in ac_automata_add /root/workspace/ntop/nDPI/src/lib/third_party/src/ahocorasick.c:280:6
    7 0x5861d0 in ndpi_add_host_risk_mask /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:4573:8
    8 0x590c0e in ndpi_handle_rule /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:4655:11
    9 0x58ffd5 in load_protocols_file_fd /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:5446:8
    10 0x552c60 in LLVMFuzzerTestOneInput /root/workspace/ntop/nDPI/fuzz/fuzz_filecfg_protocols.c:21:3
    11 0x44be94 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x44be94) (Build
Id: 36867732af52eb22433f5e34fe5422a8af281aa6)
    12 0x4334f7 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x4334f7) (BuildId: 3
6867732af52eb22433f5e34fe5422a8af281aa6)
    13 0x4391e1 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x4
391e1) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    14 0x467323 in main (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x467323) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    15 0x7fce386e97e4 in __libc_start_main (/lib64/libc.so.6+0x3a7e4) (BuildId: b81415c1738806b536fb1599d7af2d15bf6a86b7)

Indirect leak of 257 byte(s) in 1 object(s) allocated from:
    0 0x50f072 in malloc (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x50f072) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    1 0x552f20 in malloc_wrapper /root/workspace/ntop/nDPI/fuzz/fuzz_common_code.c:16:31
    2 0x68a0a5 in ndpi_malloc /root/workspace/ntop/nDPI/src/lib/ndpi_memory.c:60:25
    3 0x68a390 in ndpi_strdup /root/workspace/ntop/nDPI/src/lib/ndpi_memory.c:113:13
    4 0x585e2b in ndpi_add_host_risk_mask /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:4558:14
    5 0x590c0e in ndpi_handle_rule /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:4655:11
    6 0x58ffd5 in load_protocols_file_fd /root/workspace/ntop/nDPI/src/lib/ndpi_main.c:5446:8
    7 0x552c60 in LLVMFuzzerTestOneInput /root/workspace/ntop/nDPI/fuzz/fuzz_filecfg_protocols.c:21:3
    8 0x44be94 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x44be94) (BuildI
d: 36867732af52eb22433f5e34fe5422a8af281aa6)
    9 0x4334f7 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x4334f7) (BuildId: 36
867732af52eb22433f5e34fe5422a8af281aa6)
    10 0x4391e1 in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x4
391e1) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    11 0x467323 in main (/media/veracrypt1/work-space/ntop/nDPI/fuzz/fuzz_filecfg_protocols+0x467323) (BuildId: 36867732af52eb22433f5e34fe5422a8af281aa6)
    ntop#12 0x7fce386e97e4 in __libc_start_main (/lib64/libc.so.6+0x3a7e4) (BuildId: b81415c1738806b536fb1599d7af2d15bf6a86b7)

SUMMARY: AddressSanitizer: 625 byte(s) leaked in 3 allocation(s).

Signed-off-by: mmaatuq <mahmoudmatook.mm@gmail.com>

src/lib/third_party/src/ahocorasick.c

@@ -335,7 +335,7 @@ AC_ERROR_t ac_automata_walk(AC_AUTOMATA_t * thiz,
     }
 
     path[ip].idx = i+1;
-    if(ip >= AC_PATTRN_MAX_LENGTH)
+    if(ip > AC_PATTRN_MAX_LENGTH)
         continue;
 
     ip++;