fix uninitialized/stale use of alloc (%m modifier) flag in scanf

[musl] / src / stdio / vfscanf.c

diff --git a/src/stdio/vfscanf.c b/src/stdio/vfscanf.c
index 6bea6ad..68c8e2c 100644 (file)
--- a/src/stdio/vfscanf.c
+++ b/src/stdio/vfscanf.c
@@ -81,6 +81,8 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
 
        for (p=(const unsigned char *)fmt; *p; p++) {
 
+               alloc = 0;
+
                if (isspace(*p)) {
                        while (isspace(p[1])) p++;
                        shlim(f, 0);
@@ -265,8 +267,10 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
                                if (size == SIZE_l) *(wchar_t **)dest = wcs;
                                else *(char **)dest = s;
                        }
-                       if (wcs) wcs[i] = 0;
-                       if (s) s[i] = 0;
+                       if (t != 'c') {
+                               if (wcs) wcs[i] = 0;
+                               if (s) s[i] = 0;
+                       }
                        break;
                case 'p':
                case 'X':