From 2a6a20ea7d894464ca6bd402058c1aadf796a48c Mon Sep 17 00:00:00 2001 From: Johannes Thumshirn Date: Thu, 23 Jun 2016 14:37:20 +0200 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 Acked-by: Narsimhulu Musini Reviewed-by: Laurence Oberman Signed-off-by: Martin K. Petersen --- 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 b0fefd67cac3..b106596cc0cf 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; -- 2.30.2