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wifi: iwlwifi: mvm: handle debugfs names more carefully

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With debugfs=off, we can get here with the dbgfs_dir being
an ERR_PTR(). Instead of checking for all this, which is
often flagged as a mistake, simply handle the names here
more carefully by printing them, then we don't need extra
checks.

Also, while checking, I noticed theoretically 'buf' is too
small, so fix that size as well.

Cc: stable@vger.kernel.org
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=218422
Fixes: c36235acb3 ("wifi: iwlwifi: mvm: rework debugfs handling")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240320232419.4dc1eb3dd015.I32f308b0356ef5bcf8d188dd98ce9b210e3ab9fd@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2024-03-20 23:26:32 +02:00
parent 17f64517bf
commit 19d82bdeda
1 changed files with 7 additions and 4 deletions
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11
drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
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@ -748,7 +748,9 @@ void iwl_mvm_vif_dbgfs_add_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
{
struct dentry *dbgfs_dir = vif->debugfs_dir;
struct iwl_mvm_vif *mvmvif = iwl_mvm_vif_from_mac80211(vif);
char buf[100];
char buf[3 * 3 + 11 + (NL80211_WIPHY_NAME_MAXLEN + 1) +
(7 + IFNAMSIZ + 1) + 6 + 1];
char name[7 + IFNAMSIZ + 1];
/* this will happen in monitor mode */
if (!dbgfs_dir)
@ -761,10 +763,11 @@ void iwl_mvm_vif_dbgfs_add_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif)
* find
* netdev:wlan0 -> ../../../ieee80211/phy0/netdev:wlan0/iwlmvm/
*/
snprintf(buf, 100, "../../../%pd3/iwlmvm", dbgfs_dir);
snprintf(name, sizeof(name), "%pd", dbgfs_dir);
snprintf(buf, sizeof(buf), "../../../%pd3/iwlmvm", dbgfs_dir);
mvmvif->dbgfs_slink = debugfs_create_symlink(dbgfs_dir->d_name.name,
mvm->debugfs_dir, buf);
mvmvif->dbgfs_slink =
debugfs_create_symlink(name, mvm->debugfs_dir, buf);
}
void iwl_mvm_vif_dbgfs_rm_link(struct iwl_mvm *mvm, struct ieee80211_vif *vif)