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Merge pull request #509 from JL2210/zero-alloc-use-fix-3

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Fix use of zero-allocated memory
This commit is contained in:
Eldred Habert
2020-04-13 02:50:58 +02:00
committed by GitHub
parent 9bec983923 57639f3765
commit cdb4c5f553
1 changed files with 12 additions and 2 deletions
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14
src/link/patch.c
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@@ -82,10 +82,20 @@ static inline void clearRPNStack(void)
static void pushRPN(int32_t value)
{
if (stack.size >= stack.capacity) {
stack.capacity *= 2;
static const size_t increase_factor = 2;
if (stack.capacity > SIZE_MAX / increase_factor)
errx(1, "Overflow in RPN stack resize");
stack.capacity *= increase_factor;
stack.buf =
realloc(stack.buf, sizeof(*stack.buf) * stack.capacity);
if (!stack.buf)
/*
* Static analysis tools complain that the capacity might become
* zero due to overflow, but fail to realize that it's caught by
* the overflow check above. Hence the stringent check below.
*/
if (!stack.buf || !stack.capacity)
err(1, "Failed to resize RPN stack");
}