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

Commit Message

Peter Seiderer Feb. 5, 2025, 1:11 p.m. UTC

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

Signed-off-by: Peter Seiderer <[e-mail]>
---
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(+)

Patch

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]))