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([2405:4802:1d38:5c70:ced9:ef96:e152:2608]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39d94b9334dsm170730a91.3.2026.09.10.08.37.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2026 08:37:51 -0700 (PDT) From: Nguyen Ngoc Thang To: Jiri Kosina , Benjamin Tissoires Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+093e05755c2d99caab91@syzkaller.appspotmail.com, Nguyen Ngoc Thang Subject: [PATCH] HID: multitouch: use GFP_ATOMIC for report/application/usage allocations Date: Thu, 10 Sep 2026 22:37:46 +0700 Message-ID: <20260910153746.16222-1-ngocthang2710.1999@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" mt_allocate_report_data(), mt_allocate_application() and mt_allocate_usage() devm_kzalloc() with GFP_KERNEL, but they are reachable from mt_event()/mt_report() via hid_report_raw_event(), which can run in (soft)irq context off a USB URB completion (e.g. dummy_hcd's hrtimer softirq). GFP_KERNEL there may call into fs_reclaim, which lockdep flags as an inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} use of fs_reclaim, alongside a "sleeping function called from invalid context" splat. Switch all three to GFP_ATOMIC since none of them are on a path that needs to sleep. Reported-by: syzbot+093e05755c2d99caab91@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3D093e05755c2d99caab91 Signed-off-by: Nguyen Ngoc Thang --- drivers/hid/hid-multitouch.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c index 2c41bacab1ca..6b68e43fd885 100644 --- a/drivers/hid/hid-multitouch.c +++ b/drivers/hid/hid-multitouch.c @@ -604,7 +604,8 @@ static struct mt_usages *mt_allocate_usage(struct hid_d= evice *hdev, { struct mt_usages *usage; =20 - usage =3D devm_kzalloc(&hdev->dev, sizeof(*usage), GFP_KERNEL); + /* may run from hid_report_raw_event() in (soft)irq context */ + usage =3D devm_kzalloc(&hdev->dev, sizeof(*usage), GFP_ATOMIC); if (!usage) return NULL; =20 @@ -633,8 +634,9 @@ static struct mt_application *mt_allocate_application(s= truct mt_device *td, unsigned int application =3D report->application; struct mt_application *mt_application; =20 + /* may run from hid_report_raw_event() in (soft)irq context */ mt_application =3D devm_kzalloc(&td->hdev->dev, sizeof(*mt_application), - GFP_KERNEL); + GFP_ATOMIC); if (!mt_application) return NULL; =20 @@ -692,7 +694,8 @@ static struct mt_report_data *mt_allocate_report_data(s= truct mt_device *td, struct hid_field *field; int r, n; =20 - rdata =3D devm_kzalloc(&td->hdev->dev, sizeof(*rdata), GFP_KERNEL); + /* may run from hid_report_raw_event() in (soft)irq context */ + rdata =3D devm_kzalloc(&td->hdev->dev, sizeof(*rdata), GFP_ATOMIC); if (!rdata) return NULL; =20 --=20 2.43.0