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-rw-r--r--lib/dynamic_debug.c11
1 files changed, 3 insertions, 8 deletions
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index e3952e9c8ec0..fe42b6ec3f0c 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -657,14 +657,9 @@ static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
pr_warn("expected <%d bytes into control\n", USER_BUF_PAGE);
return -E2BIG;
}
- tmpbuf = kmalloc(len + 1, GFP_KERNEL);
- if (!tmpbuf)
- return -ENOMEM;
- if (copy_from_user(tmpbuf, ubuf, len)) {
- kfree(tmpbuf);
- return -EFAULT;
- }
- tmpbuf[len] = '\0';
+ tmpbuf = memdup_user_nul(ubuf, len);
+ if (IS_ERR(tmpbuf))
+ return PTR_ERR(tmpbuf);
vpr_info("read %d bytes from userspace\n", (int)len);
ret = ddebug_exec_queries(tmpbuf, NULL);