* [PATCH] netlabel: remove redundant assignment to pointer iter
@ 2019-09-01 15:52 Colin King
2019-09-01 16:04 ` Paul Moore
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Colin King @ 2019-09-01 15:52 UTC (permalink / raw)
To: Paul Moore, David S . Miller, netdev, linux-security-module
Cc: kernel-janitors, linux-kernel
From: Colin Ian King <colin.king@canonical.com>
Pointer iter is being initialized with a value that is never read and
is being re-assigned a little later on. The assignment is redundant
and hence can be removed.
Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
net/netlabel/netlabel_kapi.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index 2b0ef55cf89e..409a3ae47ce2 100644
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -607,7 +607,7 @@ static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
*/
int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
{
- struct netlbl_lsm_catmap *iter = catmap;
+ struct netlbl_lsm_catmap *iter;
u32 idx;
u32 bit;
NETLBL_CATMAP_MAPTYPE bitmap;
--
2.20.1
^ permalink raw reply related [flat|nested] 6+ messages in thread* Re: [PATCH] netlabel: remove redundant assignment to pointer iter
2019-09-01 15:52 [PATCH] netlabel: remove redundant assignment to pointer iter Colin King
@ 2019-09-01 16:04 ` Paul Moore
2019-09-01 17:20 ` Christophe JAILLET
[not found] ` <de0cd774-8fce-d69a-8ea4-3c7b2ee3a918@wanadoo.fr>
2019-09-01 18:23 ` Paul Moore
2019-09-01 18:45 ` David Miller
2 siblings, 2 replies; 6+ messages in thread
From: Paul Moore @ 2019-09-01 16:04 UTC (permalink / raw)
To: Colin King
Cc: David S . Miller, netdev, linux-security-module, kernel-janitors,
linux-kernel
On Sun, Sep 1, 2019 at 11:52 AM Colin King <colin.king@canonical.com> wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Pointer iter is being initialized with a value that is never read and
> is being re-assigned a little later on. The assignment is redundant
> and hence can be removed.
>
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/netlabel/netlabel_kapi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
This patch doesn't seem correct to me, at least not in current form.
At the top of _netlbl_catmap_getnode() is a check to see if iter is
NULL (as well as a few other checks on iter after that); this patch
would break that code.
Perhaps we can get rid of the iter/catmap assignment when we define
iter, but I don't think this patch is the right way to do it.
> diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
> index 2b0ef55cf89e..409a3ae47ce2 100644
> --- a/net/netlabel/netlabel_kapi.c
> +++ b/net/netlabel/netlabel_kapi.c
> @@ -607,7 +607,7 @@ static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
> */
> int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
> {
> - struct netlbl_lsm_catmap *iter = catmap;
> + struct netlbl_lsm_catmap *iter;
> u32 idx;
> u32 bit;
> NETLBL_CATMAP_MAPTYPE bitmap;
> --
> 2.20.1
--
paul moore
www.paul-moore.com
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] netlabel: remove redundant assignment to pointer iter
2019-09-01 16:04 ` Paul Moore
@ 2019-09-01 17:20 ` Christophe JAILLET
[not found] ` <de0cd774-8fce-d69a-8ea4-3c7b2ee3a918@wanadoo.fr>
1 sibling, 0 replies; 6+ messages in thread
From: Christophe JAILLET @ 2019-09-01 17:20 UTC (permalink / raw)
To: Paul Moore, Colin King
Cc: David S . Miller, netdev, linux-security-module, kernel-janitors,
linux-kernel
Le 01/09/2019 à 18:04, Paul Moore a écrit :
> On Sun, Sep 1, 2019 at 11:52 AM Colin King <colin.king@canonical.com> wrote:
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> Pointer iter is being initialized with a value that is never read and
>> is being re-assigned a little later on. The assignment is redundant
>> and hence can be removed.
>>
>> Addresses-Coverity: ("Unused value")
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>> net/netlabel/netlabel_kapi.c | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
> This patch doesn't seem correct to me, at least not in current form.
> At the top of _netlbl_catmap_getnode() is a check to see if iter is
> NULL (as well as a few other checks on iter after that); this patch
> would break that code.
>
> Perhaps we can get rid of the iter/catmap assignment when we define
> iter, but I don't think this patch is the right way to do it.
>
>> diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
>> index 2b0ef55cf89e..409a3ae47ce2 100644
>> --- a/net/netlabel/netlabel_kapi.c
>> +++ b/net/netlabel/netlabel_kapi.c
>> @@ -607,7 +607,7 @@ static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
>> */
>> int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
>> {
>> - struct netlbl_lsm_catmap *iter = catmap;
>> + struct netlbl_lsm_catmap *iter;
>> u32 idx;
>> u32 bit;
>> NETLBL_CATMAP_MAPTYPE bitmap;
>> --
>> 2.20.1
>
Hi,
'iter' is reassigned a value between the declaration and the NULL test, so removing the first initialization looks good to me.
int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
{
|
struct netlbl_lsm_catmap *iter = catmap;
u32 idx;
u32 bit;
NETLBL_CATMAP_MAPTYPE bitmap;
iter = _netlbl_catmap_getnode(&catmap, offset, _CM_F_WALK, 0); <-- Here
if (iter == NULL)
return -ENOENT; This is dead code since commit d960a6184a92 ("netlabel: fix the catmap walking functions") where the call to _netlbl_catmap_getnode has been introduced.
Just my 2c,
CJ|
^ permalink raw reply [flat|nested] 6+ messages in thread[parent not found: <de0cd774-8fce-d69a-8ea4-3c7b2ee3a918@wanadoo.fr>]
* Re: [PATCH] netlabel: remove redundant assignment to pointer iter
[not found] ` <de0cd774-8fce-d69a-8ea4-3c7b2ee3a918@wanadoo.fr>
@ 2019-09-01 18:22 ` Paul Moore
0 siblings, 0 replies; 6+ messages in thread
From: Paul Moore @ 2019-09-01 18:22 UTC (permalink / raw)
To: Christophe JAILLET
Cc: Colin King, David S . Miller, netdev, linux-security-module,
kernel-janitors, linux-kernel
On Sun, Sep 1, 2019 at 1:16 PM Christophe JAILLET
<christophe.jaillet@wanadoo.fr> wrote:
> Le 01/09/2019 à 18:04, Paul Moore a écrit :
>
> On Sun, Sep 1, 2019 at 11:52 AM Colin King <colin.king@canonical.com> wrote:
>
> From: Colin Ian King <colin.king@canonical.com>
>
> Pointer iter is being initialized with a value that is never read and
> is being re-assigned a little later on. The assignment is redundant
> and hence can be removed.
>
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/netlabel/netlabel_kapi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> This patch doesn't seem correct to me, at least not in current form.
> At the top of _netlbl_catmap_getnode() is a check to see if iter is
> NULL (as well as a few other checks on iter after that); this patch
> would break that code.
>
> Perhaps we can get rid of the iter/catmap assignment when we define
> iter, but I don't think this patch is the right way to do it.
>
> diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
> index 2b0ef55cf89e..409a3ae47ce2 100644
> --- a/net/netlabel/netlabel_kapi.c
> +++ b/net/netlabel/netlabel_kapi.c
> @@ -607,7 +607,7 @@ static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
> */
> int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
> {
> - struct netlbl_lsm_catmap *iter = catmap;
> + struct netlbl_lsm_catmap *iter;
> u32 idx;
> u32 bit;
> NETLBL_CATMAP_MAPTYPE bitmap;
> --
> 2.20.1
>
> 'iter' is reassigned a value between the declaration and the NULL test, so removing the fist initialisation looks good to me.
This is what I get when I try to review patches quickly while doing
other things on the weekend <sigh> ... yes, you are correct, I was
looking at _netlbl_catmap_getnode() and not netlbl_catmap_walk(); my
apologies.
--
paul moore
www.paul-moore.com
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] netlabel: remove redundant assignment to pointer iter
2019-09-01 15:52 [PATCH] netlabel: remove redundant assignment to pointer iter Colin King
2019-09-01 16:04 ` Paul Moore
@ 2019-09-01 18:23 ` Paul Moore
2019-09-01 18:45 ` David Miller
2 siblings, 0 replies; 6+ messages in thread
From: Paul Moore @ 2019-09-01 18:23 UTC (permalink / raw)
To: Colin King
Cc: David S . Miller, netdev, linux-security-module, kernel-janitors,
linux-kernel
On Sun, Sep 1, 2019 at 11:52 AM Colin King <colin.king@canonical.com> wrote:
> From: Colin Ian King <colin.king@canonical.com>
>
> Pointer iter is being initialized with a value that is never read and
> is being re-assigned a little later on. The assignment is redundant
> and hence can be removed.
>
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
> net/netlabel/netlabel_kapi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
Acked-by: Paul Moore <paul@paul-moore.com>
> diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
> index 2b0ef55cf89e..409a3ae47ce2 100644
> --- a/net/netlabel/netlabel_kapi.c
> +++ b/net/netlabel/netlabel_kapi.c
> @@ -607,7 +607,7 @@ static struct netlbl_lsm_catmap *_netlbl_catmap_getnode(
> */
> int netlbl_catmap_walk(struct netlbl_lsm_catmap *catmap, u32 offset)
> {
> - struct netlbl_lsm_catmap *iter = catmap;
> + struct netlbl_lsm_catmap *iter;
> u32 idx;
> u32 bit;
> NETLBL_CATMAP_MAPTYPE bitmap;
> --
> 2.20.1
--
paul moore
www.paul-moore.com
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] netlabel: remove redundant assignment to pointer iter
2019-09-01 15:52 [PATCH] netlabel: remove redundant assignment to pointer iter Colin King
2019-09-01 16:04 ` Paul Moore
2019-09-01 18:23 ` Paul Moore
@ 2019-09-01 18:45 ` David Miller
2 siblings, 0 replies; 6+ messages in thread
From: David Miller @ 2019-09-01 18:45 UTC (permalink / raw)
To: colin.king
Cc: paul, netdev, linux-security-module, kernel-janitors, linux-kernel
From: Colin King <colin.king@canonical.com>
Date: Sun, 1 Sep 2019 16:52:05 +0100
> From: Colin Ian King <colin.king@canonical.com>
>
> Pointer iter is being initialized with a value that is never read and
> is being re-assigned a little later on. The assignment is redundant
> and hence can be removed.
>
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
Applied to net-next.
^ permalink raw reply [flat|nested] 6+ messages in thread
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2019-09-01 15:52 [PATCH] netlabel: remove redundant assignment to pointer iter Colin King
2019-09-01 16:04 ` Paul Moore
2019-09-01 17:20 ` Christophe JAILLET
[not found] ` <de0cd774-8fce-d69a-8ea4-3c7b2ee3a918@wanadoo.fr>
2019-09-01 18:22 ` Paul Moore
2019-09-01 18:23 ` Paul Moore
2019-09-01 18:45 ` David Miller
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