sysctl: do not error out showing write-only data. Closes 6386

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

1 files changed, 3 insertions, 0 deletions

diff --git a/procps/sysctl.c b/procps/sysctl.c
index c6a1de21d..f0883f054 100644
--- a/procps/sysctl.c
+++ b/procps/sysctl.c
@@ -129,6 +129,9 @@ static int sysctl_act_on_setting(char *setting)
 
         if (fd < 0) {
                 switch (errno) {
+                case EACCES:
+                        /* Happens for write-only settings, e.g. net.ipv6.route.flush */
+                        goto end;
                 case ENOENT:
                         if (option_mask32 & FLAG_SHOW_KEY_ERRORS)
                                 bb_error_msg("error: '%s' is an unknown key", outname);