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SUNRPC: Fix potential memory scribble in xprt_free_bc_request() 

The call to xprt_free_allocation() will call list_del() on
req->rq_bc_pa_list, which is not attached to a list.
This patch moves the list_del() out of xprt_free_allocation()
and into those callers that need it.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2014-02-11 13:56:54 -05:00
parent 06ea0bfe6e
commit 628356791b
1 changed files with 4 additions and 2 deletions
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6
net/sunrpc/backchannel_rqst.c
View File

@ -64,7 +64,6 @@ static void xprt_free_allocation(struct rpc_rqst *req)
free_page((unsigned long)xbufp->head[0].iov_base);
xbufp = &req->rq_snd_buf;
free_page((unsigned long)xbufp->head[0].iov_base);
list_del(&req->rq_bc_pa_list);
kfree(req);
}
@ -168,8 +167,10 @@ out_free:
/*
* Memory allocation failed, free the temporary list
*/
list_for_each_entry_safe(req, tmp, &tmp_list, rq_bc_pa_list)
list_for_each_entry_safe(req, tmp, &tmp_list, rq_bc_pa_list) {
list_del(&req->rq_bc_pa_list);
xprt_free_allocation(req);
}
dprintk("RPC: setup backchannel transport failed\n");
return -ENOMEM;
@ -198,6 +199,7 @@ void xprt_destroy_backchannel(struct rpc_xprt *xprt, unsigned int max_reqs)
xprt_dec_alloc_count(xprt, max_reqs);
list_for_each_entry_safe(req, tmp, &xprt->bc_pa_list, rq_bc_pa_list) {
dprintk("RPC: req=%p\n", req);
list_del(&req->rq_bc_pa_list);
xprt_free_allocation(req);
if (--max_reqs == 0)
break;