- Original Message -
> From: "Johannes Thumshirn"
> To: "Martin K . Petersen" , "James Bottomley"
>
> Cc: "Linux SCSI Mailinglist" , "Linux Kernel
> Mailinglist" ,
> "Narsimhulu Musini" , "Sesidhar Baddela"
> , "Johannes Thumshirn"
>
> Sent: Thursday, June 23, 2016 8:37:20 AM
> Subject: [PATCH] snic: Fix use-after-free in case of a dma mapping error
>
> If there is a dma mapping error snic kfree()s buf right before printing it.
> Change the order to not accidently trip on memory that's not owned by us
> anymore.
>
> Signed-off-by: Johannes Thumshirn
> ---
> drivers/scsi/snic/snic_disc.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/scsi/snic/snic_disc.c b/drivers/scsi/snic/snic_disc.c
> index b0fefd6..b106596 100644
> --- a/drivers/scsi/snic/snic_disc.c
> +++ b/drivers/scsi/snic/snic_disc.c
> @@ -113,11 +113,11 @@ snic_queue_report_tgt_req(struct snic *snic)
>
> pa = pci_map_single(snic->pdev, buf, buf_len, PCI_DMA_FROMDEVICE);
> if (pci_dma_mapping_error(snic->pdev, pa)) {
> - kfree(buf);
> - snic_req_free(snic, rqi);
> SNIC_HOST_ERR(snic->shost,
> "Rpt-tgt rspbuf %p: PCI DMA Mapping Failed\n",
> buf);
> + kfree(buf);
> + snic_req_free(snic, rqi);
> ret = -EINVAL;
>
> goto error;
> --
> 2.8.4
>
> --
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>
Looks fine to me
Reviewed-by Laurence Oberman
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