[PATCH AUTOSEL 5.9 15/23] scsi: storvsc: Validate length of incoming packet in storvsc_on_channel_callback()
Andrea Parri
parri.andrea at gmail.com
Sat Dec 12 18:09:01 UTC 2020
Hi Sasha,
On Sat, Dec 12, 2020 at 11:07:56AM -0500, Sasha Levin wrote:
> From: "Andrea Parri (Microsoft)" <parri.andrea at gmail.com>
>
> [ Upstream commit 3b8c72d076c42bf27284cda7b2b2b522810686f8 ]
FYI, we found that this commit introduced a regression and posted a
revert:
https://lkml.kernel.org/r/20201211131404.21359-1-parri.andrea@gmail.com
Same comment for the AUTOSEL 5.4, 4.19 and 4.14 you've just posted.
Andrea
>
> Check that the packet is of the expected size at least, don't copy data
> past the packet.
>
> Link: https://lore.kernel.org/r/20201118145348.109879-1-parri.andrea@gmail.com
> Cc: "James E.J. Bottomley" <jejb at linux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen at oracle.com>
> Cc: linux-scsi at vger.kernel.org
> Reported-by: Saruhan Karademir <skarade at microsoft.com>
> Signed-off-by: Andrea Parri (Microsoft) <parri.andrea at gmail.com>
> Signed-off-by: Martin K. Petersen <martin.petersen at oracle.com>
> Signed-off-by: Sasha Levin <sashal at kernel.org>
> ---
> drivers/scsi/storvsc_drv.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
> index 8f5f5dc863a4a..6779ee4edfee3 100644
> --- a/drivers/scsi/storvsc_drv.c
> +++ b/drivers/scsi/storvsc_drv.c
> @@ -1246,6 +1246,11 @@ static void storvsc_on_channel_callback(void *context)
> request = (struct storvsc_cmd_request *)
> ((unsigned long)desc->trans_id);
>
> + if (hv_pkt_datalen(desc) < sizeof(struct vstor_packet) - vmscsi_size_delta) {
> + dev_err(&device->device, "Invalid packet len\n");
> + continue;
> + }
> +
> if (request == &stor_device->init_request ||
> request == &stor_device->reset_request) {
> memcpy(&request->vstor_packet, packet,
> --
> 2.27.0
>
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