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X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: c33c9f88-1eb7-4099-9700-16013fd9e8aa X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: FZ8Eo1/0pIuopUHibh1Za69ETGVF7GfaPuTVAP9Lu/Z7RH2NqolXAe7yhx4H2KB+EvELEUh17lRRXSMYUhBiYA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA3PR12MB7950 X-Authority-Analysis: v=2.4 cv=UvMxNPwB c=1 sm=1 tr=0 ts=67354c1e cx=c_pps a=t4gDRyhI9k+KZ5gXRQysFQ==:117 a=t4gDRyhI9k+KZ5gXRQysFQ==:17 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=8nJEP1OIZ-IA:10 a=VlfZXiiP6vEA:10 a=nEwiWwFL_bsA:10 a=qPHU084jO2kA:10 a=VwQbUJbxAAAA:8 a=jIQo8A4GAAAA:8 a=G-WRxraSjgDgK3-KZ7kA:9 a=wPNLvfGTeEIA:10 a=Lf5xNeLK5dgiOs8hzIjU:22 X-Proofpoint-GUID: 0F8NQY8sLdZpGYkm0VmQS6CUu3j2YFyu X-Proofpoint-ORIG-GUID: 0F8NQY8sLdZpGYkm0VmQS6CUu3j2YFyu X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_active_cloned_notspam policy=outbound_active_cloned score=0 mlxlogscore=919 priorityscore=1501 malwarescore=0 adultscore=0 clxscore=1015 impostorscore=0 suspectscore=0 spamscore=0 mlxscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 classifier=spam authscore=0 adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2411140005 The dwc3_request->num_queued_sgs is decremented on completion. If a partially completed request is handled, then the dwc3_request->num_queued_sgs no longer reflects the total number of num_queued_sgs (it would be cleared). Correctly check the number of request SG entries remained to be prepare and queued. Failure to do this may cause null pointer dereference when accessing non-existent SG entry. Cc: stable@vger.kernel.org Fixes: c96e6725db9d ("usb: dwc3: gadget: Correct the logic for queuing sgs") Signed-off-by: Thinh Nguyen --- drivers/usb/dwc3/gadget.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index 38c3769a6c48..3a5a0d8be33c 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1470,8 +1470,8 @@ static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep, struct scatterlist *s; int i; unsigned int length = req->request.length; - unsigned int remaining = req->request.num_mapped_sgs - - req->num_queued_sgs; + unsigned int remaining = req->num_pending_sgs; + unsigned int num_queued_sgs = req->request.num_mapped_sgs - remaining; unsigned int num_trbs = req->num_trbs; bool needs_extra_trb = dwc3_needs_extra_trb(dep, req); @@ -1479,7 +1479,7 @@ static int dwc3_prepare_trbs_sg(struct dwc3_ep *dep, * If we resume preparing the request, then get the remaining length of * the request and resume where we left off. */ - for_each_sg(req->request.sg, s, req->num_queued_sgs, i) + for_each_sg(req->request.sg, s, num_queued_sgs, i) length -= sg_dma_len(s); for_each_sg(sg, s, remaining, i) {