> On Nov 18, 2022, at 11:34 PM, Zhang Xiaoxu <zhangxiaoxu5@xxxxxxxxxx> wrote:
>
> If rdma receive buffer allocate failed, should call rpcrdma_regbuf_free()
> to free the send buffer, otherwise, the buffer data will be leaked.
>
> Fixes: 8cec3dba76a4 ("xprtrdma: rpcrdma_regbuf alignment")
Actually Fixes: bb93a1ae2bf4 ("xprtrdma: Allocate req's regbufs
at xprt create time") might be better. bb93a1ae2bf4 is the commit
that incorrectly added the kfree() to rpcrdma_req_create().
Even though 8cec3dba76a4 is what split the regbufs into two
allocations, your fix isn't applicable to the rpcrdma_req_create()
that's in 8cec3dba76a4.
> Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@xxxxxxxxxx>
I'm guessing the error path is getting exercised more once
f20f18c95630 ("xprtrdma: Prevent memory allocations from driving
a reclaim") has been applied. Good catch!
Reviewed-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
> ---
> net/sunrpc/xprtrdma/verbs.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/net/sunrpc/xprtrdma/verbs.c b/net/sunrpc/xprtrdma/verbs.c
> index 44b87e4274b4..b098fde373ab 100644
> --- a/net/sunrpc/xprtrdma/verbs.c
> +++ b/net/sunrpc/xprtrdma/verbs.c
> @@ -831,7 +831,7 @@ struct rpcrdma_req *rpcrdma_req_create(struct rpcrdma_xprt *r_xprt,
> return req;
>
> out3:
> - kfree(req->rl_sendbuf);
> + rpcrdma_regbuf_free(req->rl_sendbuf);
> out2:
> kfree(req);
> out1:
> --
> 2.31.1
>
--
Chuck Lever
