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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 <jthumshirn@suse.de>
Acked-by: Narsimhulu Musini <nmusini@cisco.com>
Reviewed-by: Laurence Oberman <loberman@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Johannes Thumshirn 2016-06-23 14:37:20 +02:00 committed by Martin K. Petersen
parent 40e4c0a4e1
commit 2a6a20ea7d
1 changed files with 2 additions and 2 deletions
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4
drivers/scsi/snic/snic_disc.c
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@ -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;