KASAN: slab-out-of-bounds Read in skb_gso_transport_seglen
Status: internal: reported C repro on 2020/04/19 10:46
Fix commit: 9274124f net: stricter validation of untrusted gso packets
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-usb], missing on: [ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci2-upstream-kcsan-gce]
First crash: 44d, last: 25d

Cause bisection: introduced by (bisect log):

commit 9d2f67e43b73e8af7438be219b66a5de0cfa8bd9
Author: Jianfeng Tan <>
Date: Sat Sep 29 15:41:27 2018 +0000

  net/packet: fix packet drop as of virtio gso

Crash: KASAN: slab-out-of-bounds Read in skb_gso_transport_seglen (log)
Repro: C syz .config
similar bugs (1):
Kernel Title Repro Bisected Count Last Reported Patched Status
linux-4.14 KASAN: slab-out-of-bounds Read in skb_gso_transport_seglen 1 26d 26d 0/1 upstream: reported on 2020/05/07 10:34

Sample crash report:

Crashes (4):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro Maintainers
ci-upstream-kasan-gce 2020/04/19 15:40 upstream 50cc09c1 6dfd45e1 .config log report syz C,,,,,,
ci-upstream-kasan-gce-386 2020/04/21 03:26 upstream ae83d0b4 98a9f9e6 .config log report syz C,,,,,,
ci-upstream-net-this-kasan-gce 2020/04/19 10:45 net 441870ee 365fba24 .config log report syz C,,,,,,
ci-upstream-linux-next-kasan-gce-root 2020/05/08 17:25 linux-next ac935d22 2b98fdbc .config log report syz C,,,,,,