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fix: add size_t overflow guard in ensure() #1057

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fix: add size_t overflow guard in ensure() #1057

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6 changes: 6 additions & 0 deletions cJSON.c
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@
#include <stdlib.h>
#include <limits.h>
#include <ctype.h>
#include <stdint.h>

#ifdef ENABLE_LOCALES
#include <locale.h>
Expand Down Expand Up @@ -394,6 +395,11 @@ static unsigned char* ensure(printbuffer * const p, size_t needed)
return NULL;
}

/* Ensure adding (p->offset + 1) won't overflow SIZE_MAX */
if (p->offset > SIZE_MAX - 1 - needed) {
return NULL;
}

needed += p->offset + 1;
if (needed <= p->length)
{
Expand Down