winetest: Avoid an infinite loop in vstrfmtmake() when the format is NULL.

When the format is NULL vsnprintf() always returns -1 so we keep doubling the allocated memory until running out of memory.

winetest: Avoid an infinite loop in vstrfmtmake() when the format is NULL.
cac02872 · Francois Gouget · Alexandre Julliard · b07129ba · cac02872
Commit cac02872 authored Feb 13, 2023 by Francois Gouget Committed by Alexandre Julliard Feb 14, 2023
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util.c programs/winetest/util.c +1 -0

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--- a/programs/winetest/util.c
+++ b/programs/winetest/util.c
@@ -56,6 +56,7 @@ static char *vstrfmtmake (size_t *lenp, const char *fmt, va_list ap)
    char *p;
    int n;
+    if (!fmt) fmt = "";
    p = xalloc(size);
    while (1) {
        n = vsnprintf (p, size, fmt, ap);