Improve corruption detection in fts3 shadow tables earlier in order to prevent an assert() from failing.

FossilOrigin-Name: a9ec8c8f80a59badabb0afdb4189f0fd2934f936530d4151de395b3a7e7c1f1f

ext/fts3/fts3_write.c

@@ -1415,6 +1415,7 @@ static int fts3SegReaderNext(
   */
   if( pReader->nDoclist > pReader->nNode-(pReader->aDoclist-pReader->aNode)
    || (pReader->nPopulate==0 && pReader->aDoclist[pReader->nDoclist-1])
+   || pReader->nDoclist==0
   ){
     return FTS_CORRUPT_VTAB;
   }

manifest

@@ -1,5 +1,5 @@
-C When\scompiling\sthe\sshell\sfor\sWinRT,\savoid\susing\sWin32\sAPIs\sthat\sare\sunavailable.
-D 2020-04-09T15:31:22.553
+C Improve\scorruption\sdetection\sin\sfts3\sshadow\stables\searlier\sin\sorder\sto\sprevent\san\sassert()\sfrom\sfailing.
+D 2020-04-16T11:35:27.558
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -100,7 +100,7 @@ F ext/fts3/fts3_tokenizer.h 64c6ef6c5272c51ebe60fc607a896e84288fcbc3
 F ext/fts3/fts3_tokenizer1.c 5c98225a53705e5ee34824087478cf477bdb7004
 F ext/fts3/fts3_unicode.c 4b9af6151c29b35ed09574937083cece7c31e911f69615e168a39677569b684d
 F ext/fts3/fts3_unicode2.c 416eb7e1e81142703520d284b768ca2751d40e31fa912cae24ba74860532bf0f
-F ext/fts3/fts3_write.c eb5c0184762a310003762db4ebd5ddcce097d9bb08804279ba33a42907f847a6
+F ext/fts3/fts3_write.c d5da5f010b2e2c1523f0e359ec43858bb724f608d3805d0e2a82ca2b466eb22e
 F ext/fts3/fts3speed.tcl b54caf6a18d38174f1a6e84219950d85e98bb1e9
 F ext/fts3/mkfts3amal.tcl 252ecb7fe6467854f2aa237bf2c390b74e71f100
 F ext/fts3/tool/fts3cov.sh c331d006359456cf6f8f953e37f2b9c7d568f3863f00bb5f7eb87fea4ac01b73
@@ -945,7 +945,7 @@ F test/fts3conf.test c84bbaec81281c1788aa545ac6e78a6bd6cde2bdbbce2da261690e3659f
 F test/fts3corrupt.test 79a32ffdcd5254e2f7fa121d9656e61949ad049c3c6554229911b7ceac37c9c6
 F test/fts3corrupt2.test bf55c3fa0b0dc8ea1c0fe5543623bd27714585da6a129038fd6999fe3b0d25f3
 F test/fts3corrupt3.test 0d5b69a0998b4adf868cc301fc78f3d0707745f1d984ce044c205cdb764b491f
-F test/fts3corrupt4.test e8ad49403179cbf714b6b669d2e0f9234ae95f4ca258a253b0f29ce28c1b027c
+F test/fts3corrupt4.test 6a1331bb51dc27acc063d26e0f1b610863b56a833ee54fa32767d17cf96bda4a
 F test/fts3corrupt5.test 0549f85ec4bd22e992f645f13c59b99d652f2f5e643dac75568bfd23a6db7ed5
 F test/fts3cov.test 7eacdbefd756cfa4dc2241974e3db2834e9b372ca215880e00032222f32194cf
 F test/fts3d.test 2bd8c97bcb9975f2334147173b4872505b6a41359a4f9068960a36afe07a679f
@@ -980,7 +980,7 @@ F test/fts3sort.test ed34c716a11cc2009a35210e84ad5f9c102362ca
 F test/fts3tok1.test a663f4cac22a9505400bc22aacb818d7055240409c28729669ea7d4cc2120d15
 F test/fts3tok_err.test 52273cd193b9036282f7bacb43da78c6be87418d
 F test/fts3varint.test 0b84a3fd4eba8a39f3687523804d18f3b322e6d4539a55bf342079c3614f2ada
-F test/fts4aa.test 9857f939f5aeb6cc4c143e74cf1cfe07ac87972240ac26d3a0100e36d02f4359
+F test/fts4aa.test 0e6bfd6a81695a39b23e448dda25d864e63dda75bde6949c45ddc95426c6c3f5
 F test/fts4check.test 6259f856604445d7b684c9b306b2efb6346834c3f50e8fc4a59a2ca6d5319ad0
 F test/fts4content.test 73bbb123420d2c46ef2fb3b24761e9acdb78b0877179d3a5d7d57aada08066f6
 F test/fts4docid.test e33c383cfbdff0284685604d256f347a18fdbf01
@@ -1860,7 +1860,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 10306118e8591e727af477a1a15d136852d21170e645bd0e75f7c88346b037d7
-R 979d0103f7b3acef2369409e370d6fa7
-U mistachkin
-Z 484824f16820465db78cbfdb9a5d496b
+P 85d3dc8c50d8dbb8eac1956e8976e861d3b671e03355ca9257060fa3dca51cc4
+R 6df0bde47e9f675523e9d30a8887c1df
+U dan
+Z 4f76143b71cc5a7c4e3cc701b84eb415

manifest.uuid

@@ -1 +1 @@
-85d3dc8c50d8dbb8eac1956e8976e861d3b671e03355ca9257060fa3dca51cc4
+a9ec8c8f80a59badabb0afdb4189f0fd2934f936530d4151de395b3a7e7c1f1f

test/fts3corrupt4.test

@@ -5834,4 +5834,17 @@ do_catchsql_test 36.1 {
   INSERT INTO f(f) VALUES ('merge=59,59');
 } {1 {database disk image is malformed}}
 
+#-------------------------------------------------------------------------
+#
+reset_db
+do_execsql_test 37.0 {
+  CREATE VIRTUAL TABLE f USING fts3(a,b);
+  INSERT INTO f_segdir VALUES (28,0,0,0,'0 0',x'00');
+  INSERT INTO f_segdir VALUES (0,241,0,0,'0 0',x'0001000030310000f1');
+}
+
+do_catchsql_test 37.1 {
+  INSERT INTO f VALUES (0,x'00');
+} {1 {database disk image is malformed}}
+
 finish_test

test/fts4aa.test

@@ -234,13 +234,13 @@ if {$tcl_platform(byteOrder)=="littleEndian"} {
 } else {
   set res {X'0000000200000000000000000000000E0000000E00000001000000010000000100000001'}
 }
-do_execsql_test fts4aa-6.10 {
+do_catchsql_test fts4aa-6.10 {
   CREATE VIRTUAL TABLE f USING fts4();
   INSERT INTO f_segdir VALUES (77,91,0,0,'255 77',x'0001308000004d5c4ddddddd4d4d7b4d4d4d614d8019ff4d05000001204d4d2e4d6e4d4d4d4b4d6c4d004d4d4d4d4d4d3d000000004d5d4d4d645d4d004d4d4d4d4d4d4d4d4d454d6910004d05ffff054d646c4d004d5d4d4d4d4d3d000000004d4d4d4d4d4d4d4d4d4d4d69624d4d4d04004d4d4d4d4d604d4ce1404d554d45');
   INSERT INTO f_segdir VALUES (77,108,0,0,'255 77',x'0001310000fa64004d4d4d3c5d4d654d4d4d614d8000ff4d05000001204d4d2e4d6e4d4d4dff4d4d4d4d4d4d00104d4d4d4d000000004d4d4d0400311d4d4d4d4d4d4d4d4d4d684d6910004d05ffff054d4d6c4d004d4d4d4d4d4d3d000000004d4d4d4d644d4d4d4d4d4d69624d4d4d03ed4d4d4d4d4d604d4ce1404d550080');
   INSERT INTO f_stat VALUES (0,x'80808080100000000064004d4d4d3c4d4d654d4d4d614d8000ff4df6ff1a00204d4d2e4d6e4d4d4d104d4d4d4d4d4d00104d4d4d4d4d4d69574d4d4d000031044d4d4d3e4d4d4c4d05004d6910');
   SELECT quote(matchinfo(f,'pnax')) from f where f match '0 1';
-} $res
+} {1 {database disk image is malformed}}
 
 # 2019-11-18 Detect infinite loop in fts3SelectLeaf()
 db close