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wifi: mac80211: don't access the TSF of a down interface

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The tsf debugfs files call the driver even if the interface
isn't up, tgriggering check-sdata-in-driver warnings.

Reject the access in that case.

Assisted-by: LLM
Fixes: 37a41b4aff ("mac80211: add ieee80211_vif param to tsf functions")
Reported-by: syzbot+1c8c45017f784e646b47@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=1c8c45017f784e646b47
Link: https://patch.msgid.link/20260908122838.201719-18-johannes@sipsolutions.net
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2026-09-08 14:28:17 +02:00
parent b481e64e44
commit 0b1de9feeb
1 changed files with 6 additions and 0 deletions
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6
net/mac80211/debugfs_netdev.c
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@ -657,6 +657,9 @@ static ssize_t ieee80211_if_fmt_tsf(
struct ieee80211_local *local = sdata->local;
u64 tsf;
if (!ieee80211_sdata_running((struct ieee80211_sub_if_data *)sdata))
return -ENETDOWN;
tsf = drv_get_tsf(local, (struct ieee80211_sub_if_data *)sdata);
return scnprintf(buf, buflen, "0x%016llx\n", (unsigned long long) tsf);
@ -670,6 +673,9 @@ static ssize_t ieee80211_if_parse_tsf(
int ret;
int tsf_is_delta = 0;
if (!ieee80211_sdata_running(sdata))
return -ENETDOWN;
if (strncmp(buf, "reset", 5) == 0) {
if (local->ops->reset_tsf) {
drv_reset_tsf(local, sdata);