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Fixed bug in potential reuse of args in vsnprintf

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This commit is contained in:
Dmitry Boulytchev 2021-12-03 03:56:58 +03:00
parent 669a4288d7
commit f953814c76
3 changed files with 12 additions and 6 deletions
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14
runtime/runtime.c
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@ -393,7 +393,7 @@ char* de_hash (int n) {
typedef struct {
char *contents;
int ptr;
int len;
int len;
} StringBuf;
static StringBuf stringBuf;
@ -421,11 +421,17 @@ static void vprintStringBuf (char *fmt, va_list args) {
int written = 0,
rest = 0;
char *buf = (char*) BOX(NULL);
va_list vsnargs;
again:
va_copy (vsnargs, args);
buf = &stringBuf.contents[stringBuf.ptr];
rest = stringBuf.len - stringBuf.ptr;
written = vsnprintf (buf, rest, fmt, args);
written = vsnprintf (buf, rest, fmt, vsnargs);
va_end(vsnargs);
if (written >= rest) {
extendStringBuf ();
@ -1219,7 +1225,7 @@ static void fix_unboxed (char *s, va_list va) {
i++;
}
s++;
}
}
}
extern void Lfailure (char *s, ...) {