diff mbox series

[RESEND] wifi: mt76: mt7996: avoid null deref in mt7996_stop_phy()

Message ID 20250408180448.19274-1-qasdev00@gmail.com (mailing list archive)
State New
Delegated to: Felix Fietkau
Headers show
Series [RESEND] wifi: mt76: mt7996: avoid null deref in mt7996_stop_phy() | expand

Checks

Context Check Description
wifibot/fixes_present success Fixes tag not required for -next series
wifibot/series_format warning Single patches do not need cover letters; Target tree name not specified in the subject
wifibot/tree_selection success Guessed tree name to be wireless-next
wifibot/ynl success Generated files up to date; no warnings/errors; no diff in generated;
wifibot/build_clang fail Errors and warnings before: 11 this patch: 11
wifibot/build_allmodconfig_warn fail Errors and warnings before: 7 this patch: 9
wifibot/build_clang_rust success No Rust files in patch. Skipping build
wifibot/build_tools success No tools touched, skip
wifibot/check_selftest success No net selftest shell script
wifibot/deprecated_api success None detected
wifibot/header_inline success No static functions without inline keyword in header files
wifibot/source_inline success Was 0 now: 0
wifibot/verify_fixes success Fixes tag looks correct
wifibot/build_32bit success Errors and warnings before: 0 this patch: 0
wifibot/checkpatch success total: 0 errors, 0 warnings, 0 checks, 14 lines checked
wifibot/kdoc success Errors and warnings before: 0 this patch: 0
wifibot/verify_signedoff success Signed-off-by tag matches author and committer

Commit Message

Qasim Ijaz April 8, 2025, 6:04 p.m. UTC 
In mt7996_stop_phy() the mt7996_phy structure is 
dereferenced before the null sanity check which could 
lead to a null deref.

Fix by moving the dereference operation after the 
sanity check.

Fixes: 69d54ce7491d ("wifi: mt76: mt7996: switch to single multi-radio wiphy")
Signed-off-by: Qasim Ijaz <qasdev00@gmail.com>
---
 drivers/net/wireless/mediatek/mt76/mt7996/main.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/main.c b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
index 66575698aef1..88e013577c0d 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/main.c
@@ -68,11 +68,13 @@  static int mt7996_start(struct ieee80211_hw *hw)
 
 static void mt7996_stop_phy(struct mt7996_phy *phy)
 {
-	struct mt7996_dev *dev = phy->dev;
+	struct mt7996_dev *dev;
 
 	if (!phy || !test_bit(MT76_STATE_RUNNING, &phy->mt76->state))
 		return;
 
+	dev = phy->dev;
+
 	cancel_delayed_work_sync(&phy->mt76->mac_work);
 
 	mutex_lock(&dev->mt76.mutex);