linux-kernel - Re: [PATCH] infiniband/core: Fix logic error in ib_get_gids_from_rdma

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Message-ID: <20251221092418.GF13030@unreal>
Date: Sun, 21 Dec 2025 11:24:18 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jang Ingyu <ingyujang25@...ea.ac.kr>
Cc: jgg@...pe.ca, linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] infiniband/core: Fix logic error in
 ib_get_gids_from_rdma_hdr()

On Fri, Dec 19, 2025 at 01:15:08PM +0900, Jang Ingyu wrote:
> Fix missing comparison operator for RDMA_NETWORK_ROCE_V1 in the
> conditional statement. The constant was used directly instead of
> being compared with net_type, causing the condition to always
> evaluate to true.

In current code, it doesn't matter as network type can be one of four
possible values, and this "else if" will be always true anyway.

I changed your patch to this and added Fixes line:
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index ee390928511ae..256f81c5803ff 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -737,14 +737,11 @@ int ib_get_gids_from_rdma_hdr(const union rdma_network_hdr *hdr,
                ipv6_addr_set_v4mapped(dst_saddr,
                                       (struct in6_addr *)dgid);
                return 0;
-       } else if (net_type == RDMA_NETWORK_IPV6 ||
-                  net_type == RDMA_NETWORK_IB || net_type == RDMA_NETWORK_ROCE_V1) {
-               *dgid = hdr->ibgrh.dgid;
-               *sgid = hdr->ibgrh.sgid;
-               return 0;
-       } else {
-               return -EINVAL;
        }
+
+       *dgid = hdr->ibgrh.dgid;
+       *sgid = hdr->ibgrh.sgid;
+       return 0;
 }
 EXPORT_SYMBOL(ib_get_gids_from_rdma_hdr);

> 
> Signed-off-by: Jang Ingyu <ingyujang25@...ea.ac.kr>
> ---
>  drivers/infiniband/core/verbs.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
> index 11b1a194d..ee3909285 100644
> --- a/drivers/infiniband/core/verbs.c
> +++ b/drivers/infiniband/core/verbs.c
> @@ -738,7 +738,7 @@ int ib_get_gids_from_rdma_hdr(const union rdma_network_hdr *hdr,
>  				       (struct in6_addr *)dgid);
>  		return 0;
>  	} else if (net_type == RDMA_NETWORK_IPV6 ||
> -		   net_type == RDMA_NETWORK_IB || RDMA_NETWORK_ROCE_V1) {
> +		   net_type == RDMA_NETWORK_IB || net_type == RDMA_NETWORK_ROCE_V1) {
>  		*dgid = hdr->ibgrh.dgid;
>  		*sgid = hdr->ibgrh.sgid;
>  		return 0;
> -- 
> 2.34.1
> 
>