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

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

Signed-off-by: Chen Gang <gang.chen@asianux.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 36547dddcdb8..d37d9dd8f463 100644
--- 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;