From 444d7be9532dcfda8e0385226c862fd7e986f607 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Mon, 17 May 2021 10:47:06 +0200 Subject: net/smc: remove device from smcd_dev_list after failed device_add() If the device_add() for a smcd_dev fails, there's no cleanup step that rolls back the earlier list_add(). The device subsequently gets freed, and we end up with a corrupted list. Add some error handling that removes the device from the list. Fixes: c6ba7c9ba43d ("net/smc: add base infrastructure for SMC-D and ISM") Signed-off-by: Julian Wiedmann Signed-off-by: Karsten Graul Signed-off-by: David S. Miller --- net/smc/smc_ism.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) (limited to 'net/smc') diff --git a/net/smc/smc_ism.c b/net/smc/smc_ism.c index 9c6e95882553..d24b96ea0eb5 100644 --- a/net/smc/smc_ism.c +++ b/net/smc/smc_ism.c @@ -428,6 +428,8 @@ EXPORT_SYMBOL_GPL(smcd_alloc_dev); int smcd_register_dev(struct smcd_dev *smcd) { + int rc; + mutex_lock(&smcd_dev_list.mutex); if (list_empty(&smcd_dev_list.list)) { u8 *system_eid = NULL; @@ -447,7 +449,14 @@ int smcd_register_dev(struct smcd_dev *smcd) dev_name(&smcd->dev), smcd->pnetid, smcd->pnetid_by_user ? " (user defined)" : ""); - return device_add(&smcd->dev); + rc = device_add(&smcd->dev); + if (rc) { + mutex_lock(&smcd_dev_list.mutex); + list_del(&smcd->list); + mutex_unlock(&smcd_dev_list.mutex); + } + + return rc; } EXPORT_SYMBOL_GPL(smcd_register_dev); -- cgit v1.2.3