Thread (7 messages) 7 messages, 3 authors, 2022-10-21

Re: [PATCH net-next 1/3] sctp: remove unnecessary NULL check in sctp_association_init()

From: Xin Long <lucien.xin@gmail.com>
Date: 2022-10-19 21:52:44
Also in: linux-sctp

On Wed, Oct 19, 2022 at 2:29 PM Alexey Kodanev
[off-list ref] wrote:
quoted hunk ↗ jump to hunk
'&asoc->ulpq' passed to sctp_ulpq_init() as the first argument,
then sctp_qlpq_init() initializes it and eventually returns the
address of the struct member back. Therefore, in this case, the
return pointer cannot be NULL.

Moreover, it seems sctp_ulpq_init() has always been used only in
sctp_association_init(), so there's really no need to return ulpq
anymore.

Detected using the static analysis tool - Svace.
Signed-off-by: Alexey Kodanev <redacted>
---
 include/net/sctp/ulpqueue.h | 3 +--
 net/sctp/associola.c        | 4 +---
 net/sctp/ulpqueue.c         | 5 +----
 3 files changed, 3 insertions(+), 9 deletions(-)
diff --git a/include/net/sctp/ulpqueue.h b/include/net/sctp/ulpqueue.h
index 0eaf8650e3b2..60f6641290c3 100644
--- a/include/net/sctp/ulpqueue.h
+++ b/include/net/sctp/ulpqueue.h
@@ -35,8 +35,7 @@ struct sctp_ulpq {
 };

 /* Prototypes. */
-struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *,
-                                struct sctp_association *);
+void sctp_ulpq_init(struct sctp_ulpq *ulpq, struct sctp_association *asoc);
 void sctp_ulpq_flush(struct sctp_ulpq *ulpq);
 void sctp_ulpq_free(struct sctp_ulpq *);
diff --git a/net/sctp/associola.c b/net/sctp/associola.c
index 3460abceba44..63ba5551c13f 100644
--- a/net/sctp/associola.c
+++ b/net/sctp/associola.c
@@ -226,8 +226,7 @@ static struct sctp_association *sctp_association_init(
        /* Create an output queue.  */
        sctp_outq_init(asoc, &asoc->outqueue);

-       if (!sctp_ulpq_init(&asoc->ulpq, asoc))
-               goto fail_init;
+       sctp_ulpq_init(&asoc->ulpq, asoc);

        if (sctp_stream_init(&asoc->stream, asoc->c.sinit_num_ostreams, 0, gfp))
                goto stream_free;
@@ -277,7 +276,6 @@ static struct sctp_association *sctp_association_init(

 stream_free:
        sctp_stream_free(&asoc->stream);
-fail_init:
        sock_put(asoc->base.sk);
        sctp_endpoint_put(asoc->ep);
        return NULL;
diff --git a/net/sctp/ulpqueue.c b/net/sctp/ulpqueue.c
index 0a8510a0c5e6..24960dcb6a21 100644
--- a/net/sctp/ulpqueue.c
+++ b/net/sctp/ulpqueue.c
@@ -38,8 +38,7 @@ static void sctp_ulpq_reasm_drain(struct sctp_ulpq *ulpq);
 /* 1st Level Abstractions */

 /* Initialize a ULP queue from a block of memory.  */
-struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *ulpq,
-                                struct sctp_association *asoc)
+void sctp_ulpq_init(struct sctp_ulpq *ulpq, struct sctp_association *asoc)
 {
        memset(ulpq, 0, sizeof(struct sctp_ulpq));
@@ -48,8 +47,6 @@ struct sctp_ulpq *sctp_ulpq_init(struct sctp_ulpq *ulpq,
        skb_queue_head_init(&ulpq->reasm_uo);
        skb_queue_head_init(&ulpq->lobby);
        ulpq->pd_mode  = 0;
-
-       return ulpq;
 }


--
2.25.1
Reviewed-by: Xin Long <lucien.xin@gmail.com>
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