From: Johannes Berg johannes.berg@intel.com
[ Upstream commit 47caf685a6854593348f216e0b489b71c10cbe03 ]
Reject invalid hints early in order to not cause a kernel WARN later if they're restored to or similar.
Reported-by: syzbot+d451401ffd00a60677ee@syzkaller.appspotmail.com Link: https://syzkaller.appspot.com/bug?extid=d451401ffd00a60677ee Link: https://lore.kernel.org/r/20200819084648.13956-1-johannes@sipsolutions.net Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- net/wireless/reg.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/net/wireless/reg.c b/net/wireless/reg.c index 437ec52d5e71f..474923175b108 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -2383,6 +2383,9 @@ int regulatory_hint_user(const char *alpha2, if (WARN_ON(!alpha2)) return -EINVAL;
+ if (!is_world_regdom(alpha2) && !is_an_alpha2(alpha2)) + return -EINVAL; + request = kzalloc(sizeof(struct regulatory_request), GFP_KERNEL); if (!request) return -ENOMEM;