From 59b179b48ce2a6076448a44531242ac2b3f6cef2 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Mon, 15 Jan 2018 09:58:27 +0100 Subject: cfg80211: check dev_set_name() return value syzbot reported a warning from rfkill_alloc(), and after a while I think that the reason is that it was doing fault injection and the dev_set_name() failed, leaving the name NULL, and we didn't check the return value and got to rfkill_alloc() with a NULL name. Since we really don't want a NULL name, we ought to check the return value. Fixes: fb28ad35906a ("net: struct device - replace bus_id with dev_name(), dev_set_name()") Reported-by: syzbot+1ddfb3357e1d7bb5b5d3@syzkaller.appspotmail.com Signed-off-by: Johannes Berg --- net/wireless/core.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/net/wireless/core.c b/net/wireless/core.c index fdde0d9..a6f3cac 100644 --- a/net/wireless/core.c +++ b/net/wireless/core.c @@ -439,6 +439,8 @@ struct wiphy *wiphy_new_nm(const struct cfg80211_ops *ops, int sizeof_priv, if (rv) goto use_default_name; } else { + int rv; + use_default_name: /* NOTE: This is *probably* safe w/out holding rtnl because of * the restrictions on phy names. Probably this call could @@ -446,7 +448,11 @@ use_default_name: * phyX. But, might should add some locking and check return * value, and use a different name if this one exists? */ - dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); + rv = dev_set_name(&rdev->wiphy.dev, PHY_NAME "%d", rdev->wiphy_idx); + if (rv < 0) { + kfree(rdev); + return NULL; + } } INIT_LIST_HEAD(&rdev->wiphy.wdev_list); -- cgit v1.1