Fix a faulty assert() in the validation logic for the LEFT JOIN strength

reduction optimization.  Problem found by OSSFuzz.

FossilOrigin-Name: 2fd62fccd13e326dbd7dd730112542c6faa56e466bf4f7b8e22ced543031280c

diff --git a/manifest b/manifest
index 71ed8fba0473f669cede2307046bf0f84202b3ab..d693735ef8829d17ecbb7d8a1162aad2ba3cd522 100644 (file)
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Enhance\sWhereLoopBuilder.iPlanLimit\sto\shandle\sa\scase\sinvolving\sthe\sOR\noptimization\sdiscovered\sovernight\sby\sOSSFuzz.
-D 2018-09-22T15:05:32.605
+C Fix\sa\sfaulty\sassert()\sin\sthe\svalidation\slogic\sfor\sthe\sLEFT\sJOIN\sstrength\nreduction\soptimization.\s\sProblem\sfound\sby\sOSSFuzz.
+D 2018-09-23T02:01:42.716
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 01e95208a78b57d056131382c493c963518f36da4c42b12a97eb324401b3a334
@@ -454,7 +454,7 @@ F src/date.c ebe1dc7c8a347117bb02570f1a931c62dd78f4a2b1b516f4837d45b7d6426957
 F src/dbpage.c 4aa7f26198934dbd002e69418220eae3dbc71b010bbac32bd78faf86b52ce6c3
 F src/dbstat.c edabb82611143727511a45ca0859b8cd037851ebe756ae3db289859dd18b6f91
 F src/delete.c 107e28d3ef8bd72fd11953374ca9107cd74e8b09c3ded076a6048742d26ce7d2
-F src/expr.c 610eea078f240e8d55e81666a65b05a42e52008d24059c59093dd18b3d15b565
+F src/expr.c cd7a294bff49641032e2a5511a8e77bfa7e71fd0a2f714de8f3c560d31d273d9
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c 972a4ba14296bef2303a0abbad1e3d82bc3c61f9e6ce4e8e9528bdee68748812
 F src/func.c 7c288b4ce309b5a8b8473514b88e1f8e69a80134509a8c0db8e39c858e367e7f
@@ -967,7 +967,7 @@ F test/fuzzdata1.db 7ee3227bad0e7ccdeb08a9e6822916777073c664
 F test/fuzzdata2.db 128b3feeb78918d075c9b14b48610145a0dd4c8d6f1ca7c2870c7e425f5bf31f
 F test/fuzzdata3.db c6586d3e3cef0fbc18108f9bb649aa77bfc38aba
 F test/fuzzdata4.db b502c7d5498261715812dd8b3c2005bad08b3a26e6489414bd13926cd3e42ed2
-F test/fuzzdata5.db 181aa05f8ca1e4f43a3618ddd4193dfca4499e81bbb9b3e03bce46961a670891
+F test/fuzzdata5.db e35f64af17ec48926481cfaf3b3855e436bd40d1cfe2d59a9474cb4b748a52a5
 F test/fuzzdata6.db 92a80e4afc172c24f662a10a612d188fb272de4a9bd19e017927c95f737de6d7
 F test/fuzzer1.test 3d4c4b7e547aba5e5511a2991e3e3d07166cfbb8
 F test/fuzzer2.test a85ef814ce071293bce1ad8dffa217cbbaad4c14
@@ -1769,7 +1769,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 50f2fa19532e0f849d61d9e2a97427cfbf64cfb787ca481ef8c860d0f24f6cfe
-R a522b9d1d3efe4bffcf66fba31076dce
+P 7b59930a1d7b664b54d5a2bc9fa385925b5f4c8f34bf401c798307e3e2dae2c6
+R f03877dafbf8630475fd3e62d89e76e5
 U drh
-Z cead1160ed2d9cc4ef006a761294eca9
+Z b1773f19e1d7fe0cd47b4aa3fa8da701

diff --git a/manifest.uuid b/manifest.uuid
index 490bf19931d9e62e6a122815e52a2d7b2951ef4e..f4bb602f2dee9f21d74c1302d0e1ee5fd647dfdc 100644 (file)
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-7b59930a1d7b664b54d5a2bc9fa385925b5f4c8f34bf401c798307e3e2dae2c6
\ No newline at end of file
+2fd62fccd13e326dbd7dd730112542c6faa56e466bf4f7b8e22ced543031280c
\ No newline at end of file

diff --git a/src/expr.c b/src/expr.c
index 1692822840fa16f2c79c25447949676a650fb3a2..fa0bcd86afccf9c3be1c42157796fc8bd9bb1160 100644 (file)
--- a/src/expr.c
+++ b/src/expr.c
@@ -4849,18 +4849,15 @@ int sqlite3ExprImpliesExpr(Parse *pParse, Expr *pE1, Expr *pE2, int iTab){
 /*
 ** This is the Expr node callback for sqlite3ExprImpliesNotNullRow().
 ** If the expression node requires that the table at pWalker->iCur
-** have a non-NULL column, then set pWalker->eCode to 1 and abort.
+** have one or more non-NULL column, then set pWalker->eCode to 1 and abort.
+**
+** This routine controls an optimization.  False positives (setting
+** pWalker->eCode to 1 when it should not be) are deadly, but false-negatives
+** (never setting pWalker->eCode) is a harmless missed optimization.
 */
 static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
-  /* This routine is only called for WHERE clause expressions and so it
-  ** cannot have any TK_AGG_COLUMN entries because those are only found
-  ** in HAVING clauses.  We can get a TK_AGG_FUNCTION in a WHERE clause,
-  ** but that is an illegal construct and the query will be rejected at
-  ** a later stage of processing, so the TK_AGG_FUNCTION case does not
-  ** need to be considered here. */
-  assert( pExpr->op!=TK_AGG_COLUMN );
+  testcase( pExpr->op==TK_AGG_COLUMN );
   testcase( pExpr->op==TK_AGG_FUNCTION );
-
   if( ExprHasProperty(pExpr, EP_FromJoin) ) return WRC_Prune;
   switch( pExpr->op ){
     case TK_ISNOT:

diff --git a/test/fuzzdata5.db b/test/fuzzdata5.db
index 2cf125414c6da8a566a947a6caa4a73b4fcd66fb..cfb0ebe7d8cf01899814f38e21c30b62acd9184c 100644 (file)
Binary files a/test/fuzzdata5.db and b/test/fuzzdata5.db differ