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-rw-r--r--src/til_str.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/src/til_str.c b/src/til_str.c
index 4c8a0ad..0a4a640 100644
--- a/src/til_str.c
+++ b/src/til_str.c
@@ -1,5 +1,6 @@
#include <assert.h>
#include <stdarg.h>
+#include <stdint.h>
#include <stdlib.h>
#include <string.h>
@@ -25,6 +26,7 @@ struct til_str_t {
#define TIL_STR_MIN_SIZE 64
+#define TIL_STR_MAX_GROWBY (TIL_STR_MIN_SIZE * 1024)
/* alloc always returns a buf w/nul terminator present */
@@ -118,11 +120,18 @@ int til_str_appendf(til_str_t *str, const char *format, ...)
len = vsnprintf(NULL, 0, format, ap);
va_end(ap);
+ if (SIZE_MAX - len < str->size.used)
+ return -EOVERFLOW;
+
if (str->size.used + len > str->size.allocated) {
char *new;
- str->size.growby += TIL_STR_MIN_SIZE;
+ if (str->size.growby < TIL_STR_MAX_GROWBY)
+ str->size.growby += TIL_STR_MIN_SIZE;
+
len = MAX(str->size.growby, len);
+ if (SIZE_MAX - len < str->size.used)
+ len = SIZE_MAX - str->size.used;
new = realloc(str->buf, str->size.used + len);
if (!new)
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