From: Daniel Golle <daniel@makrotopia.org>
Date: Wed, 4 Aug 2021 15:35:29 +0000 (+0100)
Subject: jail: don't ignore return value of write()
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=516bdf26d4f60dc5fb063da8715fed2bad24dbd0;p=project%2Fprocd.git

jail: don't ignore return value of write()

Check return value of write() call when writing to sysctl.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---

diff --git a/jail/jail.c b/jail/jail.c
index 2fa3b2a..92ced45 100644
--- a/jail/jail.c
+++ b/jail/jail.c
@@ -536,7 +536,10 @@ static int apply_sysctl(const char *jail_root)
 			ERROR("sysctl: can't open %s\n", fname);
 			return errno;
 		}
-		write(f, (*cur)->value, strlen((*cur)->value));
+		if (write(f, (*cur)->value, strlen((*cur)->value)) < 0) {
+			ERROR("sysctl: write to %s\n", fname);
+			return errno;
+		}
 
 		free(fname);
 		close(f);