From: Alok Tiwari Date: Tue, 30 Dec 2025 05:21:18 +0000 (-0800) Subject: net: marvell: prestera: fix NULL dereference on devlink_alloc() failure X-Git-Tag: v5.15.198~31 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8a4333b2818f0d853b43e139936c20659366e4a0;p=thirdparty%2Fkernel%2Fstable.git net: marvell: prestera: fix NULL dereference on devlink_alloc() failure [ Upstream commit a428e0da1248c353557970848994f35fd3f005e2 ] devlink_alloc() may return NULL on allocation failure, but prestera_devlink_alloc() unconditionally calls devlink_priv() on the returned pointer. This leads to a NULL pointer dereference if devlink allocation fails. Add a check for a NULL devlink pointer and return NULL early to avoid the crash. Fixes: 34dd1710f5a3 ("net: marvell: prestera: Add basic devlink support") Signed-off-by: Alok Tiwari Acked-by: Elad Nachman Link: https://patch.msgid.link/20251230052124.897012-1-alok.a.tiwari@oracle.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- diff --git a/drivers/net/ethernet/marvell/prestera/prestera_devlink.c b/drivers/net/ethernet/marvell/prestera/prestera_devlink.c index 68b442eb6d694..59e865df6cee0 100644 --- a/drivers/net/ethernet/marvell/prestera/prestera_devlink.c +++ b/drivers/net/ethernet/marvell/prestera/prestera_devlink.c @@ -396,6 +396,8 @@ struct prestera_switch *prestera_devlink_alloc(struct prestera_device *dev) dl = devlink_alloc(&prestera_dl_ops, sizeof(struct prestera_switch), dev->dev); + if (!dl) + return NULL; return devlink_priv(dl); }