Re: [PATCH] crypto: ccp - zero the cmd data after use it

From: Herbert Xu
Date: Mon Aug 03 2020 - 08:53:40 EST

On Mon, Aug 03, 2020 at 03:58:58PM +0800, Liwei Song wrote:
> exist the following assignment in ccp(ignore the force
> convert of the struct) by list_del in ccp_dequeue_cmd():
> req->__ctx->cmd->entry->next = LIST_POISON1;
> after use the req, kzfree(req) can not zero the entry
> entry->next = LIST_POISON1 of the ccp_cmd(cmd) struct
> when this address available as slub freelist pointer, this will cause
> the following "general protection fault" error if some process meet
> this LIST_POISON1 value address when request memory:

Your description makes no sense. Please rewrite it and explain
the problem properly.

Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
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