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Add the exprNodeCopy() routine that will safely memcpy() an Expr node that

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might be a size-reduced node.

FossilOrigin-Name: a874c649960ba2e2b2fd380d08c02a45884a1060d3922be8847729008ca6766e
This commit is contained in:
drh 2019-01-05 21:56:12 +00:00
parent 6b86e51eea
commit a8e057618a
3 changed files with 19 additions and 10 deletions
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12
manifest
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@ -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
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U drh
Z 0ecb0f548cba4686a2646d7c9efbc968
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manifest.uuid
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@ -1 +1 @@
598d7358e7329f0de6e3defc217665909e46874258ac29592ee2fd53e6411cda
a874c649960ba2e2b2fd380d08c02a45884a1060d3922be8847729008ca6766e

15
src/expr.c
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@ -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;