Messages in this thread | | | Date | Mon, 26 Feb 2024 11:59:06 +0100 | Subject | Re: [syzbot] [usb-storage?] divide error in isd200_ata_command | From | Oliver Neukum <> |
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Hi,
On 26.02.24 10:42, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: f2e367d6ad3b Merge tag 'for-6.8/dm-fix-3' of git://git.ker.. > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=114e10e4180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=eff9f3183d0a20dd > dashboard link: https://syzkaller.appspot.com/bug?extid=28748250ab47a8f04100 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1064b372180000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10aca6ac180000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/c55ca1fdc5ad/disk-f2e367d6.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/4556a82fb4ed/vmlinux-f2e367d6.xz > kernel image: https://storage.googleapis.com/syzbot-assets/95338ed9dad1/bzImage-f2e367d6.xz > > The issue was bisected to: > > commit 321da3dc1f3c92a12e3c5da934090d2992a8814c > Author: Martin K. Petersen <martin.petersen@oracle.com> > Date: Tue Feb 13 14:33:06 2024 +0000 > > scsi: sd: usb_storage: uas: Access media prior to querying device properties
preliminary analysis:
It oopses here:
} else { if (!id[ATA_ID_SECTORS] || !id[ATA_ID_HEADS]) goto too_early; sectnum = (u8)((lba % id[ATA_ID_SECTORS]) + 1); cylinder = (u16)(lba / (id[ATA_ID_SECTORS] * id[ATA_ID_HEADS]));
in isd200_scsi_to_ata() because it must not be called before isd200_get_inquiry_data() has completed.
That raises two questions.
1) should we limit the read_before_ms flag to the cases transparent SCSI is used? 2) does isd200_get_inquiry_data() need to validate what it reads?
Regards Oliver
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