From: Karel Zak <kzak@redhat.com>
Date: Mon, 29 Apr 2024 12:55:16 +0000 (+0200)
Subject: wall: make sure unsigned variable not underflow
X-Git-Tag: v2.42-start~368
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=1658c0150e4a3d87d1e36b7755de0079e2e6a133;p=thirdparty%2Futil-linux.git

wall: make sure unsigned variable not underflow

Signed-off-by: Karel Zak <kzak@redhat.com>
---

diff --git a/term-utils/ttymsg.c b/term-utils/ttymsg.c
index faa0344fe..ef7e35899 100644
--- a/term-utils/ttymsg.c
+++ b/term-utils/ttymsg.c
@@ -123,7 +123,7 @@ ttymsg(struct iovec *iov, size_t iovcnt, char *line, int tmout) {
 				    iovcnt * sizeof(struct iovec));
 				iov = localiov;
 			}
-			for (cnt = 0; wret >= (ssize_t) iov->iov_len; ++cnt) {
+			for (cnt = 0; wret >= (ssize_t) iov->iov_len && iovcnt > 0; ++cnt) {
 				wret -= iov->iov_len;
 				++iov;
 				--iovcnt;