5.15-stable review patch. If anyone has any objections, please let me know.
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From: Breno Leitao leitao@debian.org
[ Upstream commit 4eae0ee0f1e6256d0b0b9dd6e72f1d9cf8f72e08 ]
The arp_req_set_public() function is called with the rtnl lock held, which provides enough synchronization protection. This makes the RCU variant of dev_getbyhwaddr() unnecessary. Switch to using the simpler dev_getbyhwaddr() function since we already have the required rtnl locking.
This change helps maintain consistency in the networking code by using the appropriate helper function for the existing locking context. Since we're not holding the RCU read lock in arp_req_set_public() existing code could trigger false positive locking warnings.
Fixes: 941666c2e3e0 ("net: RCU conversion of dev_getbyhwaddr() and arp_ioctl()") Suggested-by: Kuniyuki Iwashima kuniyu@amazon.com Reviewed-by: Kuniyuki Iwashima kuniyu@amazon.com Signed-off-by: Breno Leitao leitao@debian.org Link: https://patch.msgid.link/20250218-arm_fix_selftest-v5-2-d3d6892db9e1@debian.... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv4/arp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c index 6879e0b70c769..ef69321886798 100644 --- a/net/ipv4/arp.c +++ b/net/ipv4/arp.c @@ -1009,7 +1009,7 @@ static int arp_req_set_public(struct net *net, struct arpreq *r, if (mask && mask != htonl(0xFFFFFFFF)) return -EINVAL; if (!dev && (r->arp_flags & ATF_COM)) { - dev = dev_getbyhwaddr_rcu(net, r->arp_ha.sa_family, + dev = dev_getbyhwaddr(net, r->arp_ha.sa_family, r->arp_ha.sa_data); if (!dev) return -ENODEV;