syzbot


divide error in fill_meta_index
Status: upstream: reported C repro on 2021/05/05 07:42
Reported-by: syzbot+7b98870d4fec9447b951@syzkaller.appspotmail.com
Fix commit: d6e621de1fce squashfs: fix divide error in calculate_skip()
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-qemu2-riscv64 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-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-arm32]
First crash: 80d, last: 80d

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: divide error in squashfs_readpage (log)
Repro: C syz .config
duplicates (1):
Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
divide error in squashfs_readpage C inconclusive 1 82d 82d 21/22 closed as dup on 2021/05/11 08:53
Patch testing requests:
Created Duration User Patch Repo Result
2021/05/05 08:37 18m paskripkin@gmail.com https://linux.googlesource.com/linux/kernel/git/torvalds/linux refs/changes/76/10676/1 OK

Sample crash report:

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/05/04 18:26 upstream d2b6f8a17919 09efdd63 .config log report syz C divide error in fill_meta_index