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authorGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-03-30 10:31:52 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-05-05 14:43:40 +0200
commit3c13f6cd254daabdd5c2505e11bc8043005e7faf (patch)
tree539fd274a8c9fa98d302cf58c9a94054fdfb88b0
parentc391e6198768b56b81295bccc473f578b79fed2d (diff)
iwlwifi: mvm: properly check debugfs dentry before using it
commit 154d4899e4111ae24e68d6ba955f46856cb046bc upstream. debugfs can now report an error code if something went wrong instead of just NULL. So if the return value is to be used as a "real" dentry, it needs to be checked if it is an error before dereferencing it. This is now happening because of ff9fb72bc077 ("debugfs: return error values, not NULL"). If multiple iwlwifi devices are in the system, this can cause problems when the driver attempts to create the main debugfs directory again. Later on in the code we fail horribly by trying to dereference a pointer that is an error value. Reported-by: Laura Abbott <labbott@redhat.com> Reported-by: Gabriel Ramirez <gabriello.ramirez@gmail.com> Cc: Johannes Berg <johannes.berg@intel.com> Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com> Cc: Luca Coelho <luciano.coelho@intel.com> Cc: Intel Linux Wireless <linuxwifi@intel.com> Cc: Kalle Valo <kvalo@codeaurora.org> Cc: stable <stable@vger.kernel.org> # 5.0 Signed-off-by: Luca Coelho <luciano.coelho@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
index 33b0af24a537..d61ab3e80759 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
@@ -1482,6 +1482,11 @@ void iwl_mvm_vif_dbgfs_register(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
return;
mvmvif->dbgfs_dir = debugfs_create_dir("iwlmvm", dbgfs_dir);
+ if (IS_ERR_OR_NULL(mvmvif->dbgfs_dir)) {
+ IWL_ERR(mvm, "Failed to create debugfs directory under %pd\n",
+ dbgfs_dir);
+ return;
+ }
if (!mvmvif->dbgfs_dir) {
IWL_ERR(mvm, "Failed to create debugfs directory under %pd\n",