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Avoid a potential (harmless) signed integer overflow in memory usage

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accounting when calling sqlite3_realloc() to reduce the size of an
allocation.

FossilOrigin-Name: 2d71cbdf6bc24f0269027c70b39ea7f342436bdb
This commit is contained in:
drh
2016-12-27 12:08:36 +00:00
parent c595419910
commit 1aa346950e
3 changed files with 8 additions and 8 deletions
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2
src/malloc.c
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@@ -519,7 +519,7 @@ void *sqlite3Realloc(void *pOld, u64 nBytes){
sqlite3_mutex_enter(mem0.mutex);
sqlite3StatusHighwater(SQLITE_STATUS_MALLOC_SIZE, (int)nBytes);
nDiff = nNew - nOld;
if( sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED) >=
if( nDiff>0 && sqlite3StatusValue(SQLITE_STATUS_MEMORY_USED) >=
mem0.alarmThreshold-nDiff ){
sqlite3MallocAlarm(nDiff);
}