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b=iB0TszsMolNQNPadXxKpZcDnVBbO9cbfBrn9utUWqbemrjYXHhlazbOXWGhVopXfTjrRP9 LO4UD2YWzPxtI2ZR9dkp6HEuMVINBjdqGiYufMqpC7T/xsJTtdCqCDjlM0qIazP5G48CRZ 3O0Bad7CQl4eurah1OIXYi04HhZ+aHA= X-MC-Unique: hrkAjoQ4OhCj-PKgQA9mxw-1 From: P J P To: Gerd Hoffmann Subject: [PATCH] es1370: check total frame count against current frame Date: Fri, 15 May 2020 01:36:08 +0530 Message-Id: <20200514200608.1744203-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.81; envelope-from=ppandit@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/14 12:05:55 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ren Ding , QEMU Developers , Hanqing Zhao , Prasad J Pandit Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Prasad J Pandit A guest user may set channel frame count via es1370_write() such that, in es1370_transfer_audio(), total frame count 'size' is lesser than the number of frames that are processed 'cnt'. int cnt =3D d->frame_cnt >> 16; int size =3D d->frame_cnt & 0xffff; if (size < cnt), it results in incorrect calculations leading to OOB access issue(s). Add check to avoid it. Reported-by: Ren Ding Reported-by: Hanqing Zhao Signed-off-by: Prasad J Pandit --- hw/audio/es1370.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/hw/audio/es1370.c b/hw/audio/es1370.c index 89c4dabcd4..5f8a83ff56 100644 --- a/hw/audio/es1370.c +++ b/hw/audio/es1370.c @@ -643,6 +643,9 @@ static void es1370_transfer_audio (ES1370State *s, stru= ct chan *d, int loop_sel, int csc_bytes =3D (csc + 1) << d->shift; int cnt =3D d->frame_cnt >> 16; int size =3D d->frame_cnt & 0xffff; + if (size < cnt) { + return; + } int left =3D ((size - cnt + 1) << 2) + d->leftover; int transferred =3D 0; int temp =3D MIN (max, MIN (left, csc_bytes)); @@ -651,7 +654,7 @@ static void es1370_transfer_audio (ES1370State *s, stru= ct chan *d, int loop_sel, addr +=3D (cnt << 2) + d->leftover; =20 if (index =3D=3D ADC_CHANNEL) { - while (temp) { + while (temp > 0) { int acquired, to_copy; =20 to_copy =3D MIN ((size_t) temp, sizeof (tmpbuf)); @@ -669,7 +672,7 @@ static void es1370_transfer_audio (ES1370State *s, stru= ct chan *d, int loop_sel, else { SWVoiceOut *voice =3D s->dac_voice[index]; =20 - while (temp) { + while (temp > 0) { int copied, to_copy; =20 to_copy =3D MIN ((size_t) temp, sizeof (tmpbuf)); --=20 2.25.4