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Wed, 30 Jan 2019 14:38:52 GMT Received: from ol7.nl.oracle.com (/10.175.63.178) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Wed, 30 Jan 2019 06:38:51 -0800 From: Liam Merwick To: kraxel@redhat.com, qemu-devel@nongnu.org Date: Wed, 30 Jan 2019 14:37:02 +0000 Message-Id: <1548859022-3969-3-git-send-email-liam.merwick@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1548859022-3969-1-git-send-email-liam.merwick@oracle.com> References: <1548859022-3969-1-git-send-email-liam.merwick@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9151 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1901300115 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 156.151.31.85 Subject: [Qemu-devel] [PATCH 2/2] usb: deal with potential Null pointer returned by usb_ep_get() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ameya.more@oracle.com, Darren.Kenny@oracle.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Liam Merwick usb_ep_get() can return a Null pointer in the (albeit unlikely) case that a NULL USBDevice is passed in via the 'dev' parameter. Before dereferencing the return value from usb_ep_get(), check its validity and use a default (invalid) value where needed. Reported by the Parfait static code analysis tool Signed-off-by: Liam Merwick Reviewed-by: Darren Kenny Reviewed-by: Mark Kanda Reviewed-by: Ameya More --- hw/usb/core.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/hw/usb/core.c b/hw/usb/core.c index 1aa0051b2b2d..9d46a4b41e99 100644 --- a/hw/usb/core.c +++ b/hw/usb/core.c @@ -733,19 +733,23 @@ struct USBEndpoint *usb_ep_get(USBDevice *dev, int pid, int ep) uint8_t usb_ep_get_type(USBDevice *dev, int pid, int ep) { struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); - return uep->type; + return uep ? uep->type : USB_ENDPOINT_XFER_INVALID; } void usb_ep_set_type(USBDevice *dev, int pid, int ep, uint8_t type) { struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); - uep->type = type; + if (uep) { + uep->type = type; + } } void usb_ep_set_ifnum(USBDevice *dev, int pid, int ep, uint8_t ifnum) { struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); - uep->ifnum = ifnum; + if (uep) { + uep->ifnum = ifnum; + } } void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep, @@ -754,6 +758,10 @@ void usb_ep_set_max_packet_size(USBDevice *dev, int pid, int ep, struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); int size, microframes; + if (!uep) { + return; + } + size = raw & 0x7ff; switch ((raw >> 11) & 3) { case 1: @@ -774,6 +782,10 @@ void usb_ep_set_max_streams(USBDevice *dev, int pid, int ep, uint8_t raw) struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); int MaxStreams; + if (!uep) { + return; + } + MaxStreams = raw & 0x1f; if (MaxStreams) { uep->max_streams = 1 << MaxStreams; @@ -785,7 +797,9 @@ void usb_ep_set_max_streams(USBDevice *dev, int pid, int ep, uint8_t raw) void usb_ep_set_halted(USBDevice *dev, int pid, int ep, bool halted) { struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); - uep->halted = halted; + if (uep) { + uep->halted = halted; + } } USBPacket *usb_ep_find_packet_by_id(USBDevice *dev, int pid, int ep, @@ -794,6 +808,10 @@ USBPacket *usb_ep_find_packet_by_id(USBDevice *dev, int pid, int ep, struct USBEndpoint *uep = usb_ep_get(dev, pid, ep); USBPacket *p; + if (!uep) { + return NULL; + } + QTAILQ_FOREACH(p, &uep->queue, queue) { if (p->id == id) { return p;