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Fix overflow when resizing path-to-string buffer. #10919

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Merged
merged 1 commit into from
Mar 30, 2018
Merged

Fix overflow when resizing path-to-string buffer. #10919

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6 changes: 2 additions & 4 deletions src/_path.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1047,15 +1047,13 @@ void quad2cubic(double x0, double y0,
char *__append_to_string(char *p, char **buffer, size_t *buffersize,
const char *content)
{
int buffersize_int = (int)*buffersize;

for (const char *i = content; *i; ++i) {
if (p < *buffer) {
/* This is just an internal error */
return NULL;
}
if (p - *buffer >= buffersize_int) {
int diff = p - *buffer;
if ((size_t)(p - *buffer) >= *buffersize) {
ptrdiff_t diff = p - *buffer;
*buffersize *= 2;
*buffer = (char *)realloc(*buffer, *buffersize);
if (*buffer == NULL) {
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