netdev - [ethtool PATCH] netlink: fix -Walloc-size

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Message-ID: <20231124230810.1656050-1-sam@gentoo.org>
Date: Fri, 24 Nov 2023 23:08:04 +0000
From: Sam James <sam@...too.org>
To: netdev@...r.kernel.org
Cc: Sam James <sam@...too.org>
Subject: [ethtool PATCH] netlink: fix -Walloc-size

GCC 14 introduces a new -Walloc-size included in -Wextra which gives:
```
netlink/strset.c: In function ‘get_perdev_by_ifindex’:
netlink/strset.c:121:16: warning: allocation of insufficient size ‘1’ for type ‘struct perdev_strings’ with size ‘648’ [-Walloc-size]
  121 |         perdev = calloc(sizeof(*perdev), 1);
      |                ^
```

The calloc prototype is:
```
void *calloc(size_t nmemb, size_t size);
```

So, just swap the number of members and size arguments to match the prototype, as
we're initialising 1 struct of size `sizeof(*perdev)`. GCC then sees we're not
doing anything wrong. This is consistent with other use in the codebase too.

Signed-off-by: Sam James <sam@...too.org>
---
 netlink/strset.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/netlink/strset.c b/netlink/strset.c
index fbc9c17..949d597 100644
--- a/netlink/strset.c
+++ b/netlink/strset.c
@@ -118,7 +118,7 @@ static struct perdev_strings *get_perdev_by_ifindex(int ifindex)
 		return perdev;
 
 	/* not found, allocate and insert into list */
-	perdev = calloc(sizeof(*perdev), 1);
+	perdev = calloc(1, sizeof(*perdev));
 	if (!perdev)
 		return NULL;
 	perdev->ifindex = ifindex;
-- 
2.43.0