More robust error check for vasprintf

* strace.c (verror_msg): More robust error check for vasprintf.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/strace.c b/strace.c
index 745294dd3a8341bf81da804f5dc5458d375d7888..c5961f5e66ed18e5d05af2a4faf2949d7be5197d 100644 (file)
--- a/strace.c
+++ b/strace.c
@@ -232,8 +232,7 @@ static void verror_msg(int err_no, const char *fmt, va_list p)
         * Thus we use vasprintf + single fprintf.
         */
        msg = NULL;
-       vasprintf(&msg, fmt, p);
-       if (msg) {
+       if (vasprintf(&msg, fmt, p) >= 0 && msg) {
                if (err_no)
                        fprintf(stderr, "%s: %s: %s\n", progname, msg, strerror(err_no));
                else