From e636c8d336489bf3eed5878299e6cc045bbad077 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:17:29 +0000
Subject: [PATCH] debug lk
---
kernel/kernel/bpf/cgroup.c | 9 ++++++---
1 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/kernel/kernel/bpf/cgroup.c b/kernel/kernel/bpf/cgroup.c
index 6d92e39..d3593a5 100644
--- a/kernel/kernel/bpf/cgroup.c
+++ b/kernel/kernel/bpf/cgroup.c
@@ -1516,7 +1516,7 @@
goto out;
}
- if (ctx.optlen > max_optlen || ctx.optlen < 0) {
+ if (optval && (ctx.optlen > max_optlen || ctx.optlen < 0)) {
ret = -EFAULT;
goto out;
}
@@ -1530,8 +1530,11 @@
}
if (ctx.optlen != 0) {
- if (copy_to_user(optval, ctx.optval, ctx.optlen) ||
- put_user(ctx.optlen, optlen)) {
+ if (optval && copy_to_user(optval, ctx.optval, ctx.optlen)) {
+ ret = -EFAULT;
+ goto out;
+ }
+ if (put_user(ctx.optlen, optlen)) {
ret = -EFAULT;
goto out;
}
--
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