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Improved robustness against OOM in the expert extension.

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FossilOrigin-Name: e732c429bafeffaf7e0f458213089c073c262a39eabb41b291e5006078ca7f98
This commit is contained in:
drh 2021-12-16 14:26:16 +00:00
parent 511b118dd2
commit e0adf60241
4 changed files with 35 additions and 17 deletions
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33
ext/expert/sqlite3expert.c
View File

@ -697,17 +697,25 @@ static int idxGetTableInfo(
){
sqlite3_stmt *p1 = 0;
int nCol = 0;
int nTab = STRLEN(zTab);
int nByte = sizeof(IdxTable) + nTab + 1;
int nTab;
int nByte;
IdxTable *pNew = 0;
int rc, rc2;
char *pCsr = 0;
int nPk = 0;
*ppOut = 0;
if( zTab==0 ) return SQLITE_ERROR;
nTab = STRLEN(zTab);
nByte = sizeof(IdxTable) + nTab + 1;
rc = idxPrintfPrepareStmt(db, &p1, pzErrmsg, "PRAGMA table_xinfo=%Q", zTab);
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(p1) ){
const char *zCol = (const char*)sqlite3_column_text(p1, 1);
const char *zColSeq = 0;
if( zCol==0 ){
rc = SQLITE_ERROR;
break;
}
nByte += 1 + STRLEN(zCol);
rc = sqlite3_table_column_metadata(
db, "main", zTab, zCol, 0, &zColSeq, 0, 0, 0
@ -734,7 +742,9 @@ static int idxGetTableInfo(
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(p1) ){
const char *zCol = (const char*)sqlite3_column_text(p1, 1);
const char *zColSeq = 0;
int nCopy = STRLEN(zCol) + 1;
int nCopy;
if( zCol==0 ) continue;
nCopy = STRLEN(zCol) + 1;
pNew->aCol[nCol].zName = pCsr;
pNew->aCol[nCol].iPk = (sqlite3_column_int(p1, 5)==1 && nPk==1);
memcpy(pCsr, zCol, nCopy);
@ -886,6 +896,7 @@ static int idxFindCompatible(
IdxConstraint *pT = pTail;
sqlite3_stmt *pInfo = 0;
const char *zIdx = (const char*)sqlite3_column_text(pIdxList, 1);
if( zIdx==0 ) continue;
/* Zero the IdxConstraint.bFlag values in the pEq list */
for(pIter=pEq; pIter; pIter=pIter->pLink) pIter->bFlag = 0;
@ -1297,6 +1308,7 @@ static int idxProcessOneTrigger(
rc = idxPrintfPrepareStmt(p->db, &pSelect, pzErr, zSql, zTab, zTab);
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSelect) ){
const char *zCreate = (const char*)sqlite3_column_text(pSelect, 0);
if( zCreate==0 ) continue;
rc = sqlite3_exec(p->dbv, zCreate, 0, 0, pzErr);
}
idxFinalize(&rc, pSelect);
@ -1399,8 +1411,9 @@ static int idxCreateVtabSchema(sqlite3expert *p, char **pzErrmsg){
const char *zName = (const char*)sqlite3_column_text(pSchema, 1);
const char *zSql = (const char*)sqlite3_column_text(pSchema, 2);
if( zType==0 || zName==0 ) continue;
if( zType[0]=='v' || zType[1]=='r' ){
rc = sqlite3_exec(p->dbv, zSql, 0, 0, pzErrmsg);
if( zSql ) rc = sqlite3_exec(p->dbv, zSql, 0, 0, pzErrmsg);
}else{
IdxTable *pTab;
rc = idxGetTableInfo(p->db, zName, &pTab, pzErrmsg);
@ -1537,6 +1550,7 @@ static void idxRemFunc(
case SQLITE_BLOB:
case SQLITE_TEXT: {
int nByte = sqlite3_value_bytes(argv[1]);
const void *pData = 0;
if( nByte>pSlot->nByte ){
char *zNew = (char*)sqlite3_realloc(pSlot->z, nByte*2);
if( zNew==0 ){
@ -1548,9 +1562,11 @@ static void idxRemFunc(
}
pSlot->n = nByte;
if( pSlot->eType==SQLITE_BLOB ){
memcpy(pSlot->z, sqlite3_value_blob(argv[1]), nByte);
pData = sqlite3_value_blob(argv[1]);
if( pData ) memcpy(pSlot->z, pData, nByte);
}else{
memcpy(pSlot->z, sqlite3_value_text(argv[1]), nByte);
pData = sqlite3_value_text(argv[1]);
memcpy(pSlot->z, pData, nByte);
}
break;
}
@ -1761,6 +1777,7 @@ static int idxPopulateStat1(sqlite3expert *p, char **pzErr){
i64 iRowid = sqlite3_column_int64(pAllIndex, 0);
const char *zTab = (const char*)sqlite3_column_text(pAllIndex, 1);
const char *zIdx = (const char*)sqlite3_column_text(pAllIndex, 2);
if( zTab==0 || zIdx==0 ) continue;
if( p->iSample<100 && iPrev!=iRowid ){
samplectx.target = (double)p->iSample / 100.0;
samplectx.iTarget = p->iSample;
@ -1827,14 +1844,14 @@ sqlite3expert *sqlite3_expert_new(sqlite3 *db, char **pzErrmsg){
/* Copy the entire schema of database [db] into [dbm]. */
if( rc==SQLITE_OK ){
sqlite3_stmt *pSql;
sqlite3_stmt *pSql = 0;
rc = idxPrintfPrepareStmt(pNew->db, &pSql, pzErrmsg,
"SELECT sql FROM sqlite_schema WHERE name NOT LIKE 'sqlite_%%'"
" AND sql NOT LIKE 'CREATE VIRTUAL %%'"
);
while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(pSql) ){
const char *zSql = (const char*)sqlite3_column_text(pSql, 0);
rc = sqlite3_exec(pNew->dbm, zSql, 0, 0, pzErrmsg);
if( zSql ) rc = sqlite3_exec(pNew->dbm, zSql, 0, 0, pzErrmsg);
}
idxFinalize(&rc, pSql);
}

14
manifest
View File

@ -1,5 +1,5 @@
C Fix\sa\spotential\sNULL\spointer\sdereference\sin\sthe\sCLI\slogic\sfor\sprinting\sthe\nschema\sof\svirtual\stables.
D 2021-12-16T13:56:04.308
C Improved\srobustness\sagainst\sOOM\sin\sthe\sexpert\sextension.
D 2021-12-16T14:26:16.891
F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -51,7 +51,7 @@ F ext/async/sqlite3async.h 46b47c79357b97ad85d20d2795942c0020dc20c532114a4980828
F ext/expert/README.md b321c2762bb93c18ea102d5a5f7753a4b8bac646cb392b3b437f633caf2020c3
F ext/expert/expert.c d548d603a4cc9e61f446cc179c120c6713511c413f82a4a32b1e1e69d3f086a4
F ext/expert/expert1.test 3c642a4e7bbb14f21ddab595436fb465a4733f47a0fe5b2855e1d5ff900ef08e
F ext/expert/sqlite3expert.c f09943e849d603a0c001471e229b2522bae7a70a77a5e28b16429ca2bb4240dc
F ext/expert/sqlite3expert.c 6ca30d73b9ed75bd56d6e0d7f2c962d2affaa72c505458619d0ff5d9cdfac204
F ext/expert/sqlite3expert.h ca81efc2679a92373a13a3e76a6138d0310e32be53d6c3bfaedabd158ea8969b
F ext/expert/test_expert.c d56c194b769bdc90cf829a14c9ecbc1edca9c850b837a4d0b13be14095c32a72
F ext/fts1/README.txt 20ac73b006a70bcfd80069bdaf59214b6cf1db5e
@ -552,7 +552,7 @@ F src/random.c 097dc8b31b8fba5a9aca1697aeb9fd82078ec91be734c16bffda620ced7ab83c
F src/resolve.c 4a1db4aadd802683db40ca2dbbb268187bd195f10cbdb7206dbd8ac988795571
F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
F src/select.c a7a3d9f54eb24821ec5f67f2e5589b68a5d42d46fc5849d7376886777d93a85a
F src/shell.c.in ee436c66e767f9ade478d6026dc96ed010ce9984d6bb0a05ee7295d4a6a5d8aa
F src/shell.c.in e1c8a1ce01c8d70e530919978b28419ab68c9d643a3de39049fa2ed0a8a655e5
F src/sqlite.h.in 5999d6db0e65afbd686b76cddc385b310aa3815624edba43987913067f50e209
F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
F src/sqlite3ext.h 8ff2fd2c166150b2e48639f5e506fb44e29f1a3f65031710b9e89d1c126ac839
@ -1934,7 +1934,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P b6fa402d159b2475a7b99ef6a5180d7bf800f90afe28cea726d346d071405045
R deeacfaf4293a19f1f0da5da107a5410
P fe44ebf6be47e1c7f2458297669dbd2b882a31595ea8759f7e8bb024ffc44d11
R 9238339fb3e82f00e85db14fa52ea256
U drh
Z c97827e8de3c5a52ec9e189c6ecc8d7b
Z 238125be5e0c8f6d8b18a0df5a618e44

2
manifest.uuid
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@ -1 +1 @@
fe44ebf6be47e1c7f2458297669dbd2b882a31595ea8759f7e8bb024ffc44d11
e732c429bafeffaf7e0f458213089c073c262a39eabb41b291e5006078ca7f98

3
src/shell.c.in
View File

@ -3519,7 +3519,7 @@ static int expertDotCommand(
if( rc==SQLITE_OK ){
pState->expert.pExpert = sqlite3_expert_new(pState->db, &zErr);
if( pState->expert.pExpert==0 ){
raw_printf(stderr, "sqlite3_expert_new: %s\n", zErr);
raw_printf(stderr, "sqlite3_expert_new: %s\n", zErr ? zErr : "out of memory");
rc = SQLITE_ERROR;
}else{
sqlite3_expert_config(
@ -3527,6 +3527,7 @@ static int expertDotCommand(
);
}
}
sqlite3_free(zErr);
return rc;
}