Hi All,
I am working with Dawson Engler's meta-compillation group @ Stanford.
In net/wanrouter/wanproc.c the authors check for a bad copy_to_user and
immediately return -EFAULT. However, it is necessary to rollback some
allocated memory. This can leak memory over time, thus leading to
system instability and lack of resources.
Thanks!
-Akash Jain
--- net/wanrouter/wanproc.c.orig Thu Apr 12 12:11:39 2001
+++ net/wanrouter/wanproc.c Thu May 17 12:52:05 2001
@@ -267,8 +267,10 @@
offs = file->f_pos;
if (offs < pos) {
len = min(pos - offs, count);
- if(copy_to_user(buf, (page + offs), len))
- return -EFAULT;
+ if(copy_to_user(buf, (page + offs), len)){
+ kfree(page);
+ return -EFAULT;
+ }
file->f_pos += len;
}
else
-
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