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Overview
| Comment: | Avoid a potential (harmless) signed integer overflow in memory usage accounting when calling sqlite3_realloc() to reduce the size of an allocation. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
2d71cbdf6bc24f0269027c70b39ea7f3 |
| User & Date: | drh 2016-12-27 12:08:36 |
Context
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2016-12-27
| ||
| 12:35 | Disable new test modules nockpt.test and interrupt2.test for incompatible permutations. Add a CORRUPT_DB term to an assert() in vdbe.c. check-in: a54e619e user: drh tags: trunk | |
| 12:08 | Avoid a potential (harmless) signed integer overflow in memory usage accounting when calling sqlite3_realloc() to reduce the size of an allocation. check-in: 2d71cbdf user: drh tags: trunk | |
| 02:43 | Minor changes to make some newer test cases work under more compile-time options. check-in: 382eea36 user: drh tags: trunk | |
Changes
Changes to src/malloc.c.
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nNew = sqlite3GlobalConfig.m.xRoundup((int)nBytes);
if( nOld==nNew ){
pNew = pOld;
}else if( sqlite3GlobalConfig.bMemstat ){
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
nDiff = nNew - nOld;
if( sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED) >=
mem0.alarmThreshold-nDiff ){
sqlite3MallocAlarm(nDiff);
}
pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
if( pNew==0 && mem0.alarmThreshold>0 ){
sqlite3MallocAlarm((int)nBytes);
pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
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| |
515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 |
nNew = sqlite3GlobalConfig.m.xRoundup((int)nBytes);
if( nOld==nNew ){
pNew = pOld;
}else if( sqlite3GlobalConfig.bMemstat ){
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
nDiff = nNew - nOld;
if( nDiff>0 && sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED) >=
mem0.alarmThreshold-nDiff ){
sqlite3MallocAlarm(nDiff);
}
pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
if( pNew==0 && mem0.alarmThreshold>0 ){
sqlite3MallocAlarm((int)nBytes);
pNew = sqlite3GlobalConfig.m.xRealloc(pOld, nNew);
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