[PATCH net-next v4 14/17] net: pktgen: hex32_arg/num_arg error out in case no characters are available

[Peter Seiderer]

In hex32_arg() and num_arg() error out in case no characters are available
(maxlen = 0).

Signed-off-by: Peter Seiderer <ps.rep...@gmx.net>
---
Changes v3 -> v4
  - new patch (factored out of patch 'net: pktgen: fix access outside of user
    given buffer in pktgen_if_write()')
---
 net/core/pktgen.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 3c42ecf17ba2..cb3b732fd0a3 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -761,6 +761,9 @@ static int hex32_arg(const char __user *user_buffer, 
unsigned long maxlen,
        int i = 0;
        *num = 0;
 
+       if (!maxlen)
+               return -EINVAL;
+
        for (; i < maxlen; i++) {
                int value;
                char c;
@@ -808,6 +811,9 @@ static long num_arg(const char __user *user_buffer, 
unsigned long maxlen,
        int i;
        *num = 0;
 
+       if (!maxlen)
+               return -EINVAL;
+
        for (i = 0; i < maxlen; i++) {
                char c;
                if (get_user(c, &user_buffer[i]))
-- 
2.48.1