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[66.33.8.210]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-1b3773ea50asm3556452c88.23.2026.11.07.23.36.18 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sat, 07 Nov 2026 23:36:18 -0800 (PST) From: To: =?utf-8?Q?'J=C3=A9r=C3=A9my_Jean'?= , "'Sean Tranchetti'" Cc: , , References: <20261031221052.1642262-1-Jeremy.Jean@oss.cyber.gouv.fr> <20261031221052.1642262-2-Jeremy.Jean@oss.cyber.gouv.fr> In-Reply-To: <20261031221052.1642262-2-Jeremy.Jean@oss.cyber.gouv.fr> Subject: RE: [PATCH net] net: qualcomm: rmnet: bound TX aggregates on byte-limit update Date: Sun, 8 Nov 2026 00:36:17 -0700 Message-ID: <000301dd6f53$d7b931f0$872b95d0$@oss.qualcomm.com> X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQIan9Ym6wgfeJXkm0ec/mIILiLtiwLTqZcCtpLKmjA= Content-Language: en-us X-Proofpoint-ORIG-GUID: Y9IVtMfIV2jlBpjUU58__O_bRR1cI2hE X-Proofpoint-Spam-Info: AW1haW4tMjYxMTA4MDAzMCBTYWx0ZWRfX87Lsbx5iIcN3 /QBUuIXt3IM9EcWpZTv/M5sV3x88lDw62vAGTnx1TjqxOsGSnVUZZIpe7fJ26Wokv51p9LraJmk CT70cfw9iLq2z7Jrngyf9FJPmrFUE9o= X-Authority-Analysis: v=2.4 cv=dZMVTnXe c=1 sm=1 tr=0 ts=6af02674 cx=c_pps a=kVLUcbK0zfr7ocalXnG1qA==:117 a=OltkOWFNRHEXGe+8VJKHzA==:17 a=IkcTkHD0fZMA:10 a=zJRp6_cAMcgA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=Um2Pa8k9VHT-vaBCBUpS:22 a=EUspDBNiAAAA:8 a=VwQbUJbxAAAA:8 a=fZt6mqSA75pAf0XC2eMA:9 a=QEXdDO2ut3YA:10 a=vr4QvYf-bLy2KjpDp97w:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMTA4MDAzMCBTYWx0ZWRfXzrKLc2Fxl9Kk CIBmbe8hGsBee4IENs0AV3pjC1KZh9Ftb7TQvDNudTVcixR4MFb48KugGb8QX2nxipSyeqs3R4m n29+9jydauMeUFC0hs2bjyGdRWnbVO89vYxspeYboupw1B053gjrsKKyIeoBwG+tKKEhL95aaX3 81jVxhLUXd9tEF+BgFU+lBryx9wiIpKlx07BPYAyN5GXi6LwNGZIvazQWlP/PxBF/UONmQxtNrI y8irgQDozS+vdObADnhdGzIu2gl+UwKcIf9RcL5NFOGsqQ+Y7zfJuq+IlJQK1/hvilTlJIw5OMQ 6m42MsRsNZgJeOBMDq4LonSdIxQgo9NwipGe9Jk1tGO64pO3YiEfw1RQqqHnfRxTdYRAprrV6YY ntcv85Rd5cEjWAwyLIkfsJ35NQQgCOv3KUQgVpIEH9HsvjFHmlBlO2UUxLOHV65T2K0fgqaezFV CIUYaKJQlPIIXGCywmg== X-Proofpoint-GUID: Y9IVtMfIV2jlBpjUU58__O_bRR1cI2hE X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.138,FMLib:17.12.100.49 definitions=2026-11-08_02,2026-11-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 malwarescore=0 spamscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 clxscore=1015 bulkscore=0 suspectscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2611040001 definitions=main-2611080030 > -----Original Message----- > From: J=C3=A9r=C3=A9my Jean > Sent: Saturday, October 31, 2026 4:11 PM > To: Subash Abhinov Kasiviswanathan > ; Sean Tranchetti > > Cc: netdev@vger.kernel.org; linux-kernel@vger.kernel.org; = J=C3=A9r=C3=A9my Jean > ; stable@vger.kernel.org > Subject: [PATCH net] net: qualcomm: rmnet: bound TX aggregates on = byte- > limit update >=20 > If userspace reduces the TX aggregation byte limit while a buffered = skb is > pending, subtracting the skb length from the new limit underflows. > The later comparison with unsigned skb->len then lets the buffered skb = grow > past the limit. >=20 > Check lengths before subtracting. Flush a buffered skb if it is = already at or > above the new byte limit. >=20 > Fixes: 64b5d1f8f2d1 ("net: qualcomm: rmnet: add tx packets = aggregation") > Cc: stable@vger.kernel.org > Signed-off-by: J=C3=A9r=C3=A9my Jean > --- > drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 12 ++++++----- > - > 1 file changed, 6 insertions(+), 6 deletions(-) >=20 > diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c > b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c > index e6f48dc9fe64..205ac81f2c82 100644 > --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c > +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c > @@ -594,7 +594,7 @@ unsigned int rmnet_map_tx_aggregate(struct sk_buff > *skb, struct rmnet_port *port > struct timespec64 diff, last; > unsigned int len =3D skb->len; > struct sk_buff *agg_skb; > - int size; > + unsigned int size; >=20 > spin_lock_bh(&port->agg_lock); > memcpy(&last, &port->agg_last, sizeof(struct timespec64)); @@ - > 606,13 +606,14 @@ unsigned int rmnet_map_tx_aggregate(struct sk_buff > *skb, struct rmnet_port *port > */ > new_packet: > diff =3D timespec64_sub(port->agg_last, last); > - size =3D port->egress_agg_params.bytes - skb->len; > + size =3D port->egress_agg_params.bytes; >=20 > - if (size < 0) { > + if (skb->len > size) { > /* dropped */ > spin_unlock_bh(&port->agg_lock); > return 0; > } > + size -=3D skb->len; >=20 > if (diff.tv_sec > 0 || diff.tv_nsec > > RMNET_AGG_BYPASS_TIME_NSEC || > size =3D=3D 0) > @@ -630,9 +631,8 @@ unsigned int rmnet_map_tx_aggregate(struct sk_buff > *skb, struct rmnet_port *port > goto schedule; > } > diff =3D timespec64_sub(port->agg_last, port->agg_time); > - size =3D port->egress_agg_params.bytes - port->skbagg_head->len; > - > - if (skb->len > size) { > + if (port->skbagg_head->len >=3D port->egress_agg_params.bytes || > + skb->len > port->egress_agg_params.bytes - port->skbagg_head- > >len) > +{ > agg_skb =3D port->skbagg_head; > reset_aggr_params(port); > spin_unlock_bh(&port->agg_lock); > -- > 2.47.3 Reviewed-by: Subash Abhinov Kasiviswanathan =