From 2ed93ed979170c3310ace5cdf75a99873ba9d317 Mon Sep 17 00:00:00 2001
From: Tim Wiederhake <twiederh@redhat.com>
Date: Thu, 22 Jul 2021 10:30:21 +0200
Subject: [PATCH] virFileReadLimFD: Cast maxlen to size_t before adding
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If the function is called with maxlen equal to `INT_MAX`, adding
one will trigger a signed integer overflow.

Signed-off-by: Tim Wiederhake <twiederh@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
---
 src/util/virfile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/virfile.c b/src/util/virfile.c
index 723e1ca6e5..ad491251a2 100644
--- a/src/util/virfile.c
+++ b/src/util/virfile.c
@@ -1422,7 +1422,7 @@ virFileReadLimFD(int fd, int maxlen, char **buf)
         errno = EINVAL;
         return -1;
     }
-    s = saferead_lim(fd, maxlen+1, &len);
+    s = saferead_lim(fd, (size_t) maxlen + 1, &len);
     if (s == NULL)
         return -1;
     if (len > maxlen || (int)len != len) {