bugfix: fixed memcpy param overlap detected by asan.

==openresty==70603==ERROR: AddressSanitizer: memcpy-param-overlap: memory ranges [0x621000001500,0x621000002181) and [0x62100000187f, 0x621000002500) overlap
    #0 0x7f3db1899ffe  (/lib64/libasan.so.5+0x99ffe)
    #1 0x9da926  (/usr/local/openresty-debug/nginx/sbin/nginx+0x9da926)
    #2 0x9dd1a1  (/usr/local/openresty-debug/nginx/sbin/nginx+0x9dd1a1)
    #3 0x4c89c6  (/usr/local/openresty-debug/nginx/sbin/nginx+0x4c89c6)
    openresty#4 0x5d1e4e  (/usr/local/openresty-debug/nginx/sbin/nginx+0x5d1e4e)
    openresty#5 0x4c89c6  (/usr/local/openresty-debug/nginx/sbin/nginx+0x4c89c6)
    openresty#6 0x5b8583  (/usr/local/openresty-debug/nginx/sbin/nginx+0x5b8583)
    openresty#7 0x4c89c6  (/usr/local/openresty-debug/nginx/sbin/nginx+0x4c89c6)
    openresty#8 0x4b4419  (/usr/local/openresty-debug/nginx/sbin/nginx+0x4b4419)
    openresty#9 0x427f16  (/usr/local/openresty-debug/nginx/sbin/nginx+0x427f16)
    openresty#10 0x7f3daff27554  (/lib64/libc.so.6+0x22554)
    openresty#11 0x42d537  (/usr/local/openresty-debug/nginx/sbin/nginx+0x42d537)

Author: pengyanfeng

src/ngx_http_lua_directive.c

@@ -1632,7 +1632,7 @@ ngx_http_lua_conf_read_lua_token(ngx_conf_t *cf,
             }
 
             if (len) {
-                ngx_memcpy(b->start, b->pos, len);
+                ngx_memmove(b->start, b->pos, len);
             }
 
             size = (ssize_t) (file_size - cf->conf_file->file.offset);

t/014-bugs.t

@@ -8,7 +8,7 @@ log_level('debug');
 
 repeat_each(3);
 
-plan tests => repeat_each() * (blocks() * 2 + 32);
+plan tests => repeat_each() * (blocks() * 2 + 33);
 
 our $HtmlDir = html_dir;
 #warn $html_dir;
@@ -1215,3 +1215,27 @@ https://github.com/openresty/lua-nginx-module/issues/1915
 GET /t
 --- response_body
 res: true
+
+
+
+=== TEST 46: nginx crash when parsing a word or a single configuration item that is too long
+https://github.com/openresty/lua-nginx-module/issues/1938
+--- http_config
+    init_worker_by_lua '
+        err_big_str = 'A NA<document><ghjnxnpnaryyhzyfehuyjxzoilebgazuifhn foo=bar><other_tag foo=bar><ahziqttu foo=bar><a foo=bar><other_tag foo=bar><other_tag foo=bar><other_tag foo=bar><nzzpftierhdtdeippzlyjrmkbtljunmkxhohxmbdmgeeazpb foo=bar></nzzpftierhdtdeippzlyjrmkbtljunmkxhohxmbdmgeeazpb><qai foo=bar></qai></other_tag></other_tag><other_tag foo=bar></other_tag><other_tag foo=bar></other_tag></other_tag><some_tag foo=bar></some_tag><some_tag foo=bar><mdbrjkon foo=bar><other_tag foo=bar></other_tag></mdbrjkon><mttiqvw foo=bar></mttiqvw></some_tag><some_tag foo=bar></some_tag></a><lae foo=bar></lae><ds foo=bar></ds><some_tag foo=bar><other_tag foo=bar></other_tag></some_tag><other_tag foo=bar></other_tag></ahziqttu></other_tag><a foo=bar><some_tag foo=bar></some_tag><some_tag foo=bar><other_tag foo=bar></other_tag></some_tag></a><other_tag foo=bar><cxfpg foo=bar></cxfpg><some_tag foo=bar></some_tag></other_tag></ghjnxnpnaryyhzyfehuyjxzoilebgazuifhn><some_tag foo=bar><other_tag foo=bar><other_tag foo=bar><some_tag foo=bar><some_tag foo=bar></some_tag><other_tag foo=bar></other_tag></some_tag><some_tag foo=bar></some_tag><some_tag foo=bar><a foo=bar></a></some_tag><a foo=bar></a></other_tag><a foo=bar></a></other_tag><a foo=bar><wblh foo=bar><jyfzglfbaxfjvhtaiysmsexwusvrvzu foo=bar><other_tag foo=bar></other_tag></jyfzglfbaxfjvrtaiysmsexwusvrvzu><a foo=bar><other_tag foo=bar></other_tag></a></wblh><ycnivdryxanudpgzmgugzyjrnacandijqitfosjrxjuosiwhxxgwgqpwzjcyelstgzveugtmjilnkydyktoqywjyydtcgtabowmbxnjpttkxqjpazdsgzeutjfzgvafnovu@zgccxvypzbkbbsizllwitznecdbyiynopkzsyazlhyslqlwkqqnzuvvdlavwvspwzpivmmreycogbinpvhvfscjmwwwllppjholetfvcbezdwrfczqbdrogr foo=bar></ycnivdryxanudpgzmgugzyjrnacandijqitfosjrxjuosiwhxxgwgqpwzjcyelstgzveugtmjilnkydyktoqywjyydtcgtabowmbxnjpttkxqjpazdsgzeutjfzgvafnovumzgccxvypzbkbbsizllwitznecdbyiynopkzsyazlhyslqlwkqqnzuvvdlavwvspwzpivmmreycogbinpvhvfscjmwwwllppjholetfvcbezdwrfczqbdrogr></a><s foo=bar></s><some_tag foo=bar></some_tag><some_tag foo=bar></some_tag></some_tag><oin foo=bar><other_tag foo=bar><other_tag foo=bar></other_tag></other_tag><other_tag foo=bar></other_tag><other_tag foo=bar></other_tag></oin><other_tag foo=bar><other_tag foo=bar><some_tag foo=bar><other_tag foo=bar></other_tag></some_tag><other_tag foo=bar><some_tag foo=bar><some_tag foo=bar><some_tag foo=bar><other_tag foo=bar></other_tag></some_tag><xg foo=bar></xg></some_tag><ibsolavsdhkcovsbqddq foo=bar><bjodqvqtcgizzbefemdqiljssgxibmprzhxifaciftbl foo=bar></bjodqvqtcgizzbefemdqiljssgxibmprzhxifaciftbl></ibsolavsdhkcovsbqddq><s foo=bar><j foo=bar><other_tag foo=bar></other_tag></j></s><other_tag foo=bar><zte foo=bar></zte><other_tag foo=bar><a foo=bar></a></other_tag></other_tag></some_tag><some_tag foo=bar><other_tag foo=bar></other_tag></some_tag></other_tag><other_tag foo=bar><some_tag foo=bar><other_tag foo=bar></other_tag><other_tag foo=bar><other_tag foo=bar><some_tag foo=bar></some_tag></other_tag></other_tag><some_tag foo=bar></some_tag></some_tag><other_tag foo=bar></other_tag></other_tag><some_tag foo=bar></some_tag></other_tag><ynorkudnfqlyozuf foo=bar><some_tag foo=bar><some_tag foo=bar></some_tag></some_tag><some_tag foo=bar><a foo=bar></a></some_tag><some_tag foo=bar><some_tag foo=bar></some_tag></some_tag><other_tag foo=bar><some_tag foo=bar><gywpe foo=bar></gywpe></some_tag><some_tag foo=bar></some_tag><some_tag foo=bar></some_tag></other_tag><some_tag foo=bar><ycbfctvudqzhnasdtgwsylenjzo foo=bar></ycbfctvudqzhnasdtgwsylenjzo></some_tag></ynorkudnfqlyozuf><some_tag foo=bar></some_tag><other_tag foo=bar></other_tag><bpxlcvo foo=bar></bpxlcvo></other_tag><other_tag foo=bar><some_tag foo=bar><some_tag foo=bar><bsgabtkeonafnvroqlmlprxxhlkayhlmxmanhomgrweqevvqowuvnrvfazckbpxihviccqvfeciafjuxpiukkyfmirugowshqyxuvkzxjwfyl foo=bar><bujx foo=bar><other_tag foo=bar></other_tag></bujx></bsgabtkeonafnvroqlmlprxxhlkayhlmxmanhomgrweqevvqowuvnrvfazckbpxihviccqvfeciafjuxpiukkyfmirugowshqyxuvkzxjwfyl></some_tag><some_tag foo=bar></some_tag><other_tag foo=bar><other_tag foo=bar></other_tag></other_tag></some_tag><other_tag foo=bar></other_tag><yn foo=bar></yn><some_tag foo=bar></some_tag></other_tag><some_tag foo=bar><some_tag foo=bar><yjfgivoaqys foo=bar><some_tag foo=bar></some_tag></yjfgivoaqys><some_tag foo=bar></some_tag></some_tag><some_tag foo=bar><some_tag foo=bar></some_tag></some_tag><other_tag foo=bar><some_tag foo=bar><other_tag foo=bar></other_tag></some_tag></other_tag><some_tag foo=bar><other_tag foo=bar><q foo=bar></q></other_tag><some_tag foo=bar><some_tag foo=bar><some_tag foo=bar><fimlcfqpgrfgmqlvy foo=bar><some_tag foo=bar><other_tag foo=bar><other_tag foo=bar><other_tag foo=bar></other_tag></other_tag><ozbxovtd foo=bar></ozbxovtd></other_tag><a foo=bar><vhilkxdosukumkwuryepsspwraoqcetjpnmplka foo=bar></vhilkxdosukumkwuryepsspwraoqcetjpnmplka><other_tag foo=bar></other_tag></a><other_tag foo=bar><a foo=bar></a></other_tag><some_tag foo=bar></some_tag></some_tag><other_tag foo=bar><other_tag foo=bar></other_tag></other_tag></fimlcfqpgrfgmqlvy></some_tag><some_tag foo=bar><some_tag foo=bar><eslmjazk foo=bar></eslmjazk><some_tag foo=bar><some_tag foo=bar></some_tag><i foo=bar></i><some_tag foo=bar></some_tag><tpwkibjgpffwateypjezqgaomneab foo=bar></tpwkibjgpffwateypjezqgaomneab></some_tag><a foo=bar></a><okpozscqucclyrbjantdwptdyxhqhfitkjmeduuagzhfontbgjkwbaocccreequtrdwoatikmalucrlffnustjdgeaskfekewxpwtgmgtmdhhbyvgafbyjfjtlwmiyfoetprbfmpasmdobxylzshferaxicajxawnxdxkpszeqeyqziglwbczzhbhzkpphemgqghwfbrlqhczjffzefstydpnufvoknbpvszxfrqtqhuybtayd foo=bar></okpozscqucclyrbjantdwptdyxhqhfitkjmeduuagzhfontbgjkwbaocccreequtrdwoatikmalucrlffnustjdgeaskfekewxpwtgmgtmdhhbyvgafbyjfjtlwmiyfoetprbfmpasmdobxylzshferaxicajxawnxdxkpszeqeyqziglwbczzhbhzkpphemgqghwfbrlqhczjffzefstydpnufvoknbpvszxfrqtqhuybtayd></some_tag><some_tag foo=bar></some_tag></some_tag><a foo=bar><other_tag foo=bar></other_tag></a><some_tag foo=bar></some_tag><other_tag foo=bar></other_tag></some_tag><pu foo=bar><a foo=bar><some_tag foo=bar></some_tag><some_tag foo=bar><dswgxeosxelilaawqnqeqdagheheqomtuisiwcneaoetifviqqgtkawqapggjmoadxhwxokszbrfvxzedyzeplkkceleiwkjvzzatawfaqkjuogpvocrkpzbcrqandfrxrrwkidpfoseyhjkapbnwenzvprrsmstcrwwgvzprbngzfsolnuoxltbazguzolvqkahdwqgosbrzxzaiozletuhqimihu foo=bar></dswgxeosxelilaawqnqeqdagheheqomtuisiwcneaoetifviqqgtkawqapggjmoadxhwxokszbrfvxzedyzeplkkceleiwkjvzzatawfaqkjuogpvocrkpzbcrqandfrxrrwkidpfoseyhjkapbnwenzvprrsmstcrwwgvzprbngzfsolnuoxltbazguzolvqkahdwqgosbrzxzaiozletuhqimihu></some_tag><qozyyy foo=bar></qozyyy></a><other_tag foo=bar><other_tag foo=bar></other_tag></other_tag><a foo=bar><some_tag foo=bar></some_tag></a><auwvp foo=bar><pdwznxmyechrdlyirpz foo=bar><some_tag foo=bar></some_tag></pdwznxmyechrdlyirpz><some_tag foo=bar><hetkrhunm foo=bar></hetkrhunm><ivaxkibutldrsmqncviihdarsmhezhijyculvmkefbsnxfbxdfzizxkediuvjpplcyhallsjvnrxjkmrjinexelrqirrixajcpqsdtdkvajlktotwzxawuterepyyvtoywpcbiwihdkrirrgbbwguqrgcybhxxyraobyyui foo=bar></ivaxkibutldrsmqncviihdarsmhezhijyculvmkefbsnxfbxdfzizxkediuvjpplcyhallsjvnrxjkmrjinexelrqirrixajcpqsdtdkvajlktotwzxawuterepyyvtoywpcbiwihdkrirrgbbwguqrgcybhxxyraobyyui></some_tag></auwvp><other_tag foo=bar></other_tag><other_tag foo=bar></other_tag></pu><tjntyubedfylkigrecanowgsmvxguybllkyrdfntpodukwzojuztpwmqijrltm foo=bar></tjntyubedfylkigrecanowgsmvxguybllkyrdfntpodukwzojuztpwmqijrltm></some_tag><ztnairlelhvuujacjepxegwehtrfkawgggwbanfwheyjdmqlxicwvbtel foo=bar></ztnairlelhvuujacjepxegwehtrfkawgggwbanfwheyjdmqlxicwvbtel><othe>'
+    ';
+--- config
+    location /t {
+        content_by_lua '
+            ngx.say("hello world")
+        ';
+    }
+--- request
+GET /t
+--- response_body
+res: true
+--- no_error_log
+[error]
+--- must_die
+--- error_log eval
+qr/\[emerg\] \d+#\d+: unexpected "A" in/