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batman-adv: Avoid sizeof on flexible structure

Message ID 20201229082421.214284-1-sven@narfation.org
State New
Delegated to: Simon Wunderlich
Headers show
Series batman-adv: Avoid sizeof on flexible structure | expand

Commit Message

Sven Eckelmann Dec. 29, 2020, 8:24 a.m. UTC
The batadv_dhcp_packet is used to read in parts of the DHCP packet and
extract relevant information for the distributed arp table. But the
structure contained the flexible member "options" which is no where used in
the code.

A sizeof on this kind of type would return the size of everything except
the flexible member. But sparse will detect this kind of sizeof and warn
with

  warning: using sizeof on a flexible structure

This can be avoided by dropping the unused flexible member.

Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
 net/batman-adv/distributed-arp-table.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/net/batman-adv/distributed-arp-table.c b/net/batman-adv/distributed-arp-table.c
index fd7ba6bb..d2ec419d 100644
--- a/net/batman-adv/distributed-arp-table.c
+++ b/net/batman-adv/distributed-arp-table.c
@@ -87,7 +87,7 @@  struct batadv_dhcp_packet {
 	__u8 sname[64];
 	__u8 file[128];
 	__be32 magic;
-	__u8 options[];
+	/* __u8 options[]; */
 };
 
 #define BATADV_DHCP_YIADDR_LEN sizeof(((struct batadv_dhcp_packet *)0)->yiaddr)