2019-07-16 02:20:43

by Hariprasad Kelam

Subject: [PATCH] net: sctp: fix warning "NULL check before some freeing functions is not needed"

This patch removes NULL checks before calling kfree.

fixes below issues reported by coccicheck
net/sctp/sm_make_chunk.c:2586:3-8: WARNING: NULL check before some
freeing functions is not needed.
net/sctp/sm_make_chunk.c:2652:3-8: WARNING: NULL check before some
freeing functions is not needed.
net/sctp/sm_make_chunk.c:2667:3-8: WARNING: NULL check before some
freeing functions is not needed.
net/sctp/sm_make_chunk.c:2684:3-8: WARNING: NULL check before some
freeing functions is not needed.

Signed-off-by: Hariprasad Kelam <[email protected]>
---
net/sctp/sm_make_chunk.c | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index ed39396..36bd8a6e 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2582,8 +2582,7 @@ static int sctp_process_param(struct sctp_association *asoc,
case SCTP_PARAM_STATE_COOKIE:
asoc->peer.cookie_len =
ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
- if (asoc->peer.cookie)
- kfree(asoc->peer.cookie);
+ kfree(asoc->peer.cookie);
asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
if (!asoc->peer.cookie)
retval = 0;
@@ -2648,8 +2647,7 @@ static int sctp_process_param(struct sctp_association *asoc,
goto fall_through;

/* Save peer's random parameter */
- if (asoc->peer.peer_random)
- kfree(asoc->peer.peer_random);
+ kfree(asoc->peer.peer_random);
asoc->peer.peer_random = kmemdup(param.p,
ntohs(param.p->length), gfp);
if (!asoc->peer.peer_random) {
@@ -2663,8 +2661,7 @@ static int sctp_process_param(struct sctp_association *asoc,
goto fall_through;

/* Save peer's HMAC list */
- if (asoc->peer.peer_hmacs)
- kfree(asoc->peer.peer_hmacs);
+ kfree(asoc->peer.peer_hmacs);
asoc->peer.peer_hmacs = kmemdup(param.p,
ntohs(param.p->length), gfp);
if (!asoc->peer.peer_hmacs) {
@@ -2680,8 +2677,7 @@ static int sctp_process_param(struct sctp_association *asoc,
if (!ep->auth_enable)
goto fall_through;

- if (asoc->peer.peer_chunks)
- kfree(asoc->peer.peer_chunks);
+ kfree(asoc->peer.peer_chunks);
asoc->peer.peer_chunks = kmemdup(param.p,
ntohs(param.p->length), gfp);
if (!asoc->peer.peer_chunks)
--
2.7.4

2019-07-16 03:01:39

by Marcelo Ricardo Leitner

Subject: Re: [PATCH] net: sctp: fix warning "NULL check before some freeing functions is not needed"

On Tue, Jul 16, 2019 at 07:50:02AM +0530, Hariprasad Kelam wrote:
> This patch removes NULL checks before calling kfree.
>
> fixes below issues reported by coccicheck
> net/sctp/sm_make_chunk.c:2586:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2652:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2667:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2684:3-8: WARNING: NULL check before some
> freeing functions is not needed.
>
> Signed-off-by: Hariprasad Kelam <[email protected]>

Acked-by: Marcelo Ricardo Leitner <[email protected]>

> ---
> net/sctp/sm_make_chunk.c | 12 ++++--------
> 1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index ed39396..36bd8a6e 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -2582,8 +2582,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> case SCTP_PARAM_STATE_COOKIE:
> asoc->peer.cookie_len =
> ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
> - if (asoc->peer.cookie)
> - kfree(asoc->peer.cookie);
> + kfree(asoc->peer.cookie);
> asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
> if (!asoc->peer.cookie)
> retval = 0;
> @@ -2648,8 +2647,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> goto fall_through;
>
> /* Save peer's random parameter */
> - if (asoc->peer.peer_random)
> - kfree(asoc->peer.peer_random);
> + kfree(asoc->peer.peer_random);
> asoc->peer.peer_random = kmemdup(param.p,
> ntohs(param.p->length), gfp);
> if (!asoc->peer.peer_random) {
> @@ -2663,8 +2661,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> goto fall_through;
>
> /* Save peer's HMAC list */
> - if (asoc->peer.peer_hmacs)
> - kfree(asoc->peer.peer_hmacs);
> + kfree(asoc->peer.peer_hmacs);
> asoc->peer.peer_hmacs = kmemdup(param.p,
> ntohs(param.p->length), gfp);
> if (!asoc->peer.peer_hmacs) {
> @@ -2680,8 +2677,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> if (!ep->auth_enable)
> goto fall_through;
>
> - if (asoc->peer.peer_chunks)
> - kfree(asoc->peer.peer_chunks);
> + kfree(asoc->peer.peer_chunks);
> asoc->peer.peer_chunks = kmemdup(param.p,
> ntohs(param.p->length), gfp);
> if (!asoc->peer.peer_chunks)
> --
> 2.7.4
>

2019-07-16 11:11:39

by Neil Horman

Subject: Re: [PATCH] net: sctp: fix warning "NULL check before some freeing functions is not needed"

On Tue, Jul 16, 2019 at 07:50:02AM +0530, Hariprasad Kelam wrote:
> This patch removes NULL checks before calling kfree.
>
> fixes below issues reported by coccicheck
> net/sctp/sm_make_chunk.c:2586:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2652:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2667:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2684:3-8: WARNING: NULL check before some
> freeing functions is not needed.
>
> Signed-off-by: Hariprasad Kelam <[email protected]>
> ---
> net/sctp/sm_make_chunk.c | 12 ++++--------
> 1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index ed39396..36bd8a6e 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -2582,8 +2582,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> case SCTP_PARAM_STATE_COOKIE:
> asoc->peer.cookie_len =
> ntohs(param.p->length) - sizeof(struct sctp_paramhdr);
> - if (asoc->peer.cookie)
> - kfree(asoc->peer.cookie);
> + kfree(asoc->peer.cookie);
> asoc->peer.cookie = kmemdup(param.cookie->body, asoc->peer.cookie_len, gfp);
> if (!asoc->peer.cookie)
> retval = 0;
> @@ -2648,8 +2647,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> goto fall_through;
>
> /* Save peer's random parameter */
> - if (asoc->peer.peer_random)
> - kfree(asoc->peer.peer_random);
> + kfree(asoc->peer.peer_random);
> asoc->peer.peer_random = kmemdup(param.p,
> ntohs(param.p->length), gfp);
> if (!asoc->peer.peer_random) {
> @@ -2663,8 +2661,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> goto fall_through;
>
> /* Save peer's HMAC list */
> - if (asoc->peer.peer_hmacs)
> - kfree(asoc->peer.peer_hmacs);
> + kfree(asoc->peer.peer_hmacs);
> asoc->peer.peer_hmacs = kmemdup(param.p,
> ntohs(param.p->length), gfp);
> if (!asoc->peer.peer_hmacs) {
> @@ -2680,8 +2677,7 @@ static int sctp_process_param(struct sctp_association *asoc,
> if (!ep->auth_enable)
> goto fall_through;
>
> - if (asoc->peer.peer_chunks)
> - kfree(asoc->peer.peer_chunks);
> + kfree(asoc->peer.peer_chunks);
> asoc->peer.peer_chunks = kmemdup(param.p,
> ntohs(param.p->length), gfp);
> if (!asoc->peer.peer_chunks)
> --
> 2.7.4
>
>

Acked-by: Neil Horman <[email protected]>

2019-07-17 19:02:19

by David Miller

Subject: Re: [PATCH] net: sctp: fix warning "NULL check before some freeing functions is not needed"

From: Hariprasad Kelam <[email protected]>
Date: Tue, 16 Jul 2019 07:50:02 +0530

> This patch removes NULL checks before calling kfree.
>
> fixes below issues reported by coccicheck
> net/sctp/sm_make_chunk.c:2586:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2652:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2667:3-8: WARNING: NULL check before some
> freeing functions is not needed.
> net/sctp/sm_make_chunk.c:2684:3-8: WARNING: NULL check before some
> freeing functions is not needed.
>
> Signed-off-by: Hariprasad Kelam <[email protected]>

Applied.