On 11/21/23 7:50 PM, Edward Adam Davis wrote:
Confirm that skb->len is not 0 to ensure that skb length is valid.
Fixes: 114039b34201 ("bpf: Move skb->len == 0 checks into __bpf_redirect")
Reported-by: syzbot+e2c932aec5c8a6e1d31c@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Edward Adam Davis <eadavis@xxxxxx>
Stan, Could you take a look at this patch?
---
net/bpf/test_run.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/bpf/test_run.c b/net/bpf/test_run.c
index c9fdcc5cdce1..78258a822a5c 100644
--- a/net/bpf/test_run.c
+++ b/net/bpf/test_run.c
@@ -845,6 +845,9 @@ static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
{
struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
+ if (!skb->len)
+ return -EINVAL;
+
if (!__skb)
return 0;
