git: 8f6561e8adbd - stable/15 - ixv: fix multicast address enumeration

The branch stable/15 has been updated by kbowling:

URL: https://cgit.FreeBSD.org/src/commit/?id=8f6561e8adbd07f52278b5a404c72d5c9643b471

commit 8f6561e8adbd07f52278b5a404c72d5c9643b471
Author:     Kevin Bowling <kbowling@FreeBSD.org>
AuthorDate: 2026-07-28 11:06:23 +0000
Commit:     Kevin Bowling <kbowling@FreeBSD.org>
CommitDate: 2026-08-08 00:34:24 +0000

    ixv: fix multicast address enumeration
    
    if_foreach_llmaddr() adds each callback return value to its running
    count.  Returning the incremented count made the address indices grow
    as 0, 1, 3, 7, and so on, eventually writing beyond the multicast
    address array.
    
    Return one address per callback and stop copying when the array is
    full, matching the ixv-1.6.12 driver.
    
    Fixes:          ff06a8dbb677 ("Mechanically convert ixgbe(4) to IfAPI")
    
    (cherry picked from commit 6020de5ad154d54c8b9a838f28612c2182330c67)
---
 sys/dev/ixgbe/if_ixv.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/dev/ixgbe/if_ixv.c b/sys/dev/ixgbe/if_ixv.c
index 8a1c1aae041d..24e6fa714a7b 100644
--- a/sys/dev/ixgbe/if_ixv.c
+++ b/sys/dev/ixgbe/if_ixv.c
@@ -842,11 +842,14 @@ ixv_negotiate_api(struct ixgbe_softc *sc)
 static u_int
 ixv_if_multi_set_cb(void *cb_arg, struct sockaddr_dl *addr, u_int cnt)
 {
+	if (cnt >= MAX_NUM_MULTICAST_ADDRESSES)
+		return (0);
+
 	bcopy(LLADDR(addr),
 	    &((u8 *)cb_arg)[cnt * IXGBE_ETH_LENGTH_OF_ADDRESS],
 	    IXGBE_ETH_LENGTH_OF_ADDRESS);
 
-	return (++cnt);
+	return (1);
 }
 
 /************************************************************************
@@ -1982,4 +1985,3 @@ ixv_init_device_features(struct ixgbe_softc *sc)
 	if (sc->feat_cap & IXGBE_FEATURE_NEEDS_CTXD)
 		sc->feat_en |= IXGBE_FEATURE_NEEDS_CTXD;
 } /* ixv_init_device_features */
-