2021-10-22 10:04:13

by CGEL

Subject: [PATCH linux-next] xfrm: Remove redundant fields and related parentheses

The variable err is not necessary in such places. It should be revmoved
for the simplicity of the code. This will cause the double parentheses
to be redundant, and the inner parentheses should be deleted.

The clang_analyzer complains as follows:

net/xfrm/xfrm_input.c:533: warning:
net/xfrm/xfrm_input.c:563: warning:

Although the value stored to 'err' is used in the enclosing expression,
the value is never actually read from 'err'.

Reported-by: Zeal Robot <[email protected]>
Signed-off-by: luo penghao <[email protected]>
---
net/xfrm/xfrm_input.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_input.c b/net/xfrm/xfrm_input.c
index 3df0861..70a8c36 100644
--- a/net/xfrm/xfrm_input.c
+++ b/net/xfrm/xfrm_input.c
@@ -530,7 +530,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
goto drop;
}

- if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
+ if (xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
goto drop;
}
@@ -560,7 +560,7 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
}

seq = 0;
- if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
+ if (!spi && xfrm_parse_spi(skb, nexthdr, &spi, &seq)) {
secpath_reset(skb);
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
goto drop;
--
2.15.2

2021-10-25 08:23:15

by Steffen Klassert

Subject: Re: [PATCH linux-next] xfrm: Remove redundant fields and related parentheses

On Fri, Oct 22, 2021 at 09:59:11AM +0000, luo penghao wrote:
> The variable err is not necessary in such places. It should be revmoved
> for the simplicity of the code. This will cause the double parentheses
> to be redundant, and the inner parentheses should be deleted.
>
> The clang_analyzer complains as follows:
>
> net/xfrm/xfrm_input.c:533: warning:
> net/xfrm/xfrm_input.c:563: warning:
>
> Although the value stored to 'err' is used in the enclosing expression,
> the value is never actually read from 'err'.
>
> Reported-by: Zeal Robot <[email protected]>
> Signed-off-by: luo penghao <[email protected]>

Is this an update to your previous patch?
If so, please mark it as such with a 'v2'
and describe what changed.

Thanks!