Retry printing when sprintf fails (reported by Stig Thormodsrud)

Instead of returning the length of the string which would have been
printed, sprintf sometimes simply returns an error code. Handle
the case and flush the printing buffer and retry.

1 files changed, 2 insertions, 14 deletions

diff --git a/lib/session.c b/lib/session.c
index cbef026..da162b0 100644
--- a/lib/session.c
+++ b/lib/session.c
@@ -716,13 +716,7 @@ retry:
 			fmt, args);
 	va_end(args);
 
-	if (ret < 0) {
-		ipset_err(session,
-			 "Internal error at printing to output buffer");
-		longjmp(printf_failure, 1);
-	}
-
-	if (ret >= IPSET_OUTBUFLEN - len) {
+	if (ret < 0 || ret >= IPSET_OUTBUFLEN - len) {
 		/* Buffer was too small, push it out and retry */
 		D("print buffer and try again: %u", len);
 		if (loop++) {
@@ -750,13 +744,7 @@ retry:
 	ret = fn(session->outbuf + len, IPSET_OUTBUFLEN - len,
 		 session->data, opt, session->envopts);
 
-	if (ret < 0) {
-		ipset_err(session,
-			"Internal error at printing to output buffer");
-		longjmp(printf_failure, 1);
-	}
-
-	if (ret >= IPSET_OUTBUFLEN - len) {
+	if (ret < 0 || ret >= IPSET_OUTBUFLEN - len) {
 		/* Buffer was too small, push it out and retry */
 		D("print buffer and try again: %u", len);
 		if (loop++) {