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Overview
| Comment: | Ensure that a key comparison does not read a collating sequence past the end of the KeyInfo, even if the key field of an index is corrupted by having a string in the last column instead of the ROWID. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
058a8006dceda78a894ea9446f057aa6 |
| User & Date: | drh 2019-01-22 02:34:35 |
Context
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2019-01-22
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| 12:21 | Fix another segfault caused by a corrupt fts3 database. check-in: ba3b8412 user: dan tags: trunk | |
| 02:34 | Ensure that a key comparison does not read a collating sequence past the end of the KeyInfo, even if the key field of an index is corrupted by having a string in the last column instead of the ROWID. check-in: 058a8006 user: drh tags: trunk | |
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2019-01-21
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| 23:18 | Enhance the btree search routine so that it does early detection of impossibly large keys and thereby avoids a large malloc() call. check-in: 3ecaaee6 user: drh tags: trunk | |
Changes
Changes to src/vdbeaux.c.
3898 3898 3899 3899 /* Extract the values to be compared. 3900 3900 */ 3901 3901 d1 += sqlite3VdbeSerialGet(&aKey1[d1], serial_type1, &mem1); 3902 3902 3903 3903 /* Do the comparison 3904 3904 */ 3905 - rc = sqlite3MemCompare(&mem1, &pPKey2->aMem[i], pKeyInfo->aColl[i]); 3905 + rc = sqlite3MemCompare(&mem1, &pPKey2->aMem[i], 3906 + pKeyInfo->nAllField>i ? pKeyInfo->aColl[i] : 0); 3906 3907 if( rc!=0 ){ 3907 3908 assert( mem1.szMalloc==0 ); /* See comment below */ 3908 3909 if( pKeyInfo->aSortOrder[i] ){ 3909 3910 rc = -rc; /* Invert the result for DESC sort order. */ 3910 3911 } 3911 3912 goto debugCompareEnd; 3912 3913 } ................................................................................ 4329 4330 rc = -1; 4330 4331 }else if( !(serial_type & 0x01) ){ 4331 4332 rc = +1; 4332 4333 }else{ 4333 4334 mem1.n = (serial_type - 12) / 2; 4334 4335 testcase( (d1+mem1.n)==(unsigned)nKey1 ); 4335 4336 testcase( (d1+mem1.n+1)==(unsigned)nKey1 ); 4336 - if( (d1+mem1.n) > (unsigned)nKey1 ){ 4337 + if( (d1+mem1.n) > (unsigned)nKey1 4338 + || (pKeyInfo = pPKey2->pKeyInfo)->nAllField<=i 4339 + ){ 4337 4340 pPKey2->errCode = (u8)SQLITE_CORRUPT_BKPT; 4338 4341 return 0; /* Corruption */ 4339 - }else if( (pKeyInfo = pPKey2->pKeyInfo)->aColl[i] ){ 4342 + }else if( pKeyInfo->aColl[i] ){ 4340 4343 mem1.enc = pKeyInfo->enc; 4341 4344 mem1.db = pKeyInfo->db; 4342 4345 mem1.flags = MEM_Str; 4343 4346 mem1.z = (char*)&aKey1[d1]; 4344 4347 rc = vdbeCompareMemString( 4345 4348 &mem1, pRhs, pKeyInfo->aColl[i], &pPKey2->errCode 4346 4349 );