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([2405:201:682f:389d:c893:d87d:d1f4:a9a9]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8249e3c39e0sm555591b3a.26.2026.02.10.19.58.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 10 Feb 2026 19:58:27 -0800 (PST) From: Deepanshu Kartikey To: mchehab@kernel.org Cc: tglx@kernel.org, mingo@kernel.org, hverkuil+cisco@kernel.org, rongqianfeng@vivo.com, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Deepanshu Kartikey , syzbot+bd7c90de4c9f1f8ab660@syzkaller.appspotmail.com Subject: [PATCH] media: dvb-core: fix uninit-value in dvb_dmxdev_read_sec Date: Wed, 11 Feb 2026 09:28:20 +0530 Message-ID: <20260211035820.54489-1-kartikey406@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" dvb_dmxdev_init() allocates the filter array using vmalloc_array(), which does not zero-initialize memory. The subsequent init loop only sets a few fields (dev, buffer.data, state), leaving other fields like todo, type, and secheader uninitialized. When dvb_demux_read() is called before the filter is fully configured, it reads these uninitialized fields, triggering a KMSAN uninit-value warning. Use vcalloc() instead to zero-initialize the entire allocation. Reported-by: syzbot+bd7c90de4c9f1f8ab660@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=3Dbd7c90de4c9f1f8ab660 Tested-by: syzbot+bd7c90de4c9f1f8ab660@syzkaller.appspotmail.com Fixes: e4b21577b463 ("media: dvb-core: use vmalloc_array to simplify code") Signed-off-by: Deepanshu Kartikey --- drivers/media/dvb-core/dmxdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/dvb-core/dmxdev.c b/drivers/media/dvb-core/dmxde= v.c index 8c6f5aafda1d..94010c4e4f89 100644 --- a/drivers/media/dvb-core/dmxdev.c +++ b/drivers/media/dvb-core/dmxdev.c @@ -1414,7 +1414,7 @@ int dvb_dmxdev_init(struct dmxdev *dmxdev, struct dvb= _adapter *dvb_adapter) if (dmxdev->demux->open(dmxdev->demux) < 0) return -EUSERS; =20 - dmxdev->filter =3D vmalloc_array(dmxdev->filternum, + dmxdev->filter =3D vcalloc(dmxdev->filternum, sizeof(struct dmxdev_filter)); if (!dmxdev->filter) return -ENOMEM; --=20 2.43.0