kernel/sysctl.c: check return value after call proc_put_char() in __do_proc_doulongve...

Need to check the return value of proc_put_char(), as was done in
__do_proc_doulongvec_minmax().

Signed-off-by: Chen Gang <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 36547dddcdb83eab551d0ee60fa34218067d1028..d37d9dd8f4635069bf65bd2a10b00e1595ae7b64 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2222,8 +2222,11 @@ static int __do_proc_doulongvec_minmax(void *data, struct ctl_table *table, int
                        *i = val;
                } else {
                        val = convdiv * (*i) / convmul;
-                       if (!first)
+                       if (!first) {
                                err = proc_put_char(&buffer, &left, '\t');
+                               if (err)
+                                       break;
+                       }
                        err = proc_put_long(&buffer, &left, val, false);
                        if (err)
                                break;