From: drh <drh@noemail.net>
Date: Sat, 5 Jan 2019 21:56:12 +0000 (+0000)
Subject: Add the exprNodeCopy() routine that will safely memcpy() an Expr node that
X-Git-Tag: version-3.27.0~202
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=a8e057618abc438ff47e8e490b3e940fddf42c9c;p=thirdparty%2Fsqlite.git

Add the exprNodeCopy() routine that will safely memcpy() an Expr node that
might be a size-reduced node.

FossilOrigin-Name: a874c649960ba2e2b2fd380d08c02a45884a1060d3922be8847729008ca6766e
---

diff --git a/manifest b/manifest
index 1c1713d76a..789f527b47 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C If\sthe\sOP_ParseSchema\sopcode\swith\sa\snon-NULL\sP4\soperand\sdoes\snot\sparse\sany\nrows\sout\sof\sthe\ssqlite_master\stable,\sthat\sindicates\sthat\sthe\ssqlite_master\ntable\sis\scorrupt,\sso\sraise\san\sSQLITE_CORRUPT\serror.
-D 2019-01-05T21:09:37.530
+C Add\sthe\sexprNodeCopy()\sroutine\sthat\swill\ssafely\smemcpy()\san\sExpr\snode\sthat\nmight\sbe\sa\ssize-reduced\snode.
+D 2019-01-05T21:56:12.090
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in d8b254f8bb81bab43c340d70d17dc3babab40fcc8a348c8255881f780a45fee6
@@ -464,7 +464,7 @@ F src/date.c ebe1dc7c8a347117bb02570f1a931c62dd78f4a2b1b516f4837d45b7d6426957
 F src/dbpage.c 135eb3b5e74f9ef74bde5cec2571192c90c86984fa534c88bf4a055076fa19b7
 F src/dbstat.c 3c8bd4e77f0244fd2bd7cc90acf116ad2f8e82d70e536637f35ac2bc99b726f9
 F src/delete.c 209cd8345b15d1843abeff2d91a6d9c765cf32ff4abcb24411c38fe08e18baab
-F src/expr.c 18ce84bab19ef59eff99a54d83ebefd28dc10d17e617f35c730ff7c8bc2b6ee7
+F src/expr.c 9ad9c40a83c4218d79de19153b7a8ba7810564a123af7e09281927990bea2964
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c aaf28be73ab21e1e8bf4ac6b94269ebc8c93238d1e6997cb44b527b622e8ae6f
 F src/func.c 7c288b4ce309b5a8b8473514b88e1f8e69a80134509a8c0db8e39c858e367e7f
@@ -1797,7 +1797,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 444c7c99beb9f8b82963e9784aa2be54124c7011f4771122b4f608c02aa26408
-R 8de40bf74ae55cb339d0834a33043a83
+P 598d7358e7329f0de6e3defc217665909e46874258ac29592ee2fd53e6411cda
+R edf6239ea759255e3950d6367e524f61
 U drh
-Z 0ecb0f548cba4686a2646d7c9efbc968
+Z 24d644d970444f08b00aecabd19ab2a7
diff --git a/manifest.uuid b/manifest.uuid
index a0bb07c982..a9143ea15c 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-598d7358e7329f0de6e3defc217665909e46874258ac29592ee2fd53e6411cda
\ No newline at end of file
+a874c649960ba2e2b2fd380d08c02a45884a1060d3922be8847729008ca6766e
\ No newline at end of file
diff --git a/src/expr.c b/src/expr.c
index 91bb7e9e50..8754bbe78e 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1099,6 +1099,16 @@ static int exprStructSize(Expr *p){
   return EXPR_FULLSIZE;
 }
 
+/*
+** Copy the complete content of an Expr node, taking care not to read
+** past the end of the structure for a reduced-size version of the source
+** Expr.
+*/
+static void exprNodeCopy(Expr *pDest, Expr *pSrc){
+  memset(pDest, 0, sizeof(Expr));
+  memcpy(pDest, pSrc, exprStructSize(pSrc));
+}
+
 /*
 ** The dupedExpr*Size() routines each return the number of bytes required
 ** to store a copy of an expression or expression tree.  They differ in
@@ -4051,7 +4061,7 @@ expr_code_doover:
       nExpr = pEList->nExpr;
       endLabel = sqlite3VdbeMakeLabel(pParse);
       if( (pX = pExpr->pLeft)!=0 ){
-        tempX = *pX;
+        exprNodeCopy(&tempX, pX);
         testcase( pX->op==TK_COLUMN );
         exprToRegister(&tempX, exprCodeVector(pParse, &tempX, &regFree1));
         testcase( regFree1==0 );
@@ -4372,13 +4382,12 @@ static void exprCodeBetween(
   Expr exprX;       /* The  x  subexpression */
   int regFree1 = 0; /* Temporary use register */
 
-
   memset(&compLeft, 0, sizeof(Expr));
   memset(&compRight, 0, sizeof(Expr));
   memset(&exprAnd, 0, sizeof(Expr));
 
   assert( !ExprHasProperty(pExpr, EP_xIsSelect) );
-  exprX = *pExpr->pLeft;
+  exprNodeCopy(&exprX, pExpr->pLeft);
   exprAnd.op = TK_AND;
   exprAnd.pLeft = &compLeft;
   exprAnd.pRight = &compRight;