From d9d5420273997664a1c09151ca86ac993f2f89c1 Mon Sep 17 00:00:00 2001 From: Ido Schimmel Date: Fri, 10 Jul 2020 16:41:38 +0300 Subject: [PATCH] mlxsw: spectrum_router: Remove inappropriate usage of WARN_ON() We should not trigger a warning when a memory allocation fails. Remove the WARN_ON(). The warning is constantly triggered by syzkaller when it is injecting faults: [ 2230.758664] FAULT_INJECTION: forcing a failure. [ 2230.758664] name failslab, interval 1, probability 0, space 0, times 0 [ 2230.762329] CPU: 3 PID: 1407 Comm: syz-executor.0 Not tainted 5.8.0-rc2+ #28 ... [ 2230.898175] WARNING: CPU: 3 PID: 1407 at drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c:6265 mlxsw_sp_router_fib_event+0xfad/0x13e0 [ 2230.898179] Kernel panic - not syncing: panic_on_warn set ... [ 2230.898183] CPU: 3 PID: 1407 Comm: syz-executor.0 Not tainted 5.8.0-rc2+ #28 [ 2230.898190] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 Fixes: 3057224e014c ("mlxsw: spectrum_router: Implement FIB offload in deferred work") Signed-off-by: Ido Schimmel Reviewed-by: Jiri Pirko Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c index 770de02..019ed50 100644 --- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_router.c @@ -6262,7 +6262,7 @@ static int mlxsw_sp_router_fib_event(struct notifier_block *nb, } fib_work = kzalloc(sizeof(*fib_work), GFP_ATOMIC); - if (WARN_ON(!fib_work)) + if (!fib_work) return NOTIFY_BAD; fib_work->mlxsw_sp = router->mlxsw_sp; -- 2.7.4