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authorAlexey Khoroshilov <khoroshilov@ispras.ru>2016-03-26 22:42:17 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-19 04:33:15 +0900
commite352506e8a871890278ba66a2d77167193ffbfa9 (patch)
tree7a268664433f343eaf8eb9feb180bb8512548a9b
parentd4fc8bf59746b6ef9bdbec42a608b89d0221b7df (diff)
USB: whci-hcd: add more checks for dma mapping error
Fixing checks for dma mapping error in qset_fill_page_list(), I have missed two similar problems in qset_add_urb_sg() and in qset_add_urb_sg_linearize(). v2: check validity of dma_addr with dma_mapping_error() in qset_free_std() as suggested by Vladimir Zapolskiy. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Reviewed-by: Vladimir Zapolskiy <vz@mleia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/host/whci/qset.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/usb/host/whci/qset.c b/drivers/usb/host/whci/qset.c
index 1a8e960..c0e6812 100644
--- a/drivers/usb/host/whci/qset.c
+++ b/drivers/usb/host/whci/qset.c
@@ -314,7 +314,7 @@ void qset_free_std(struct whc *whc, struct whc_std *std)
kfree(std->bounce_buf);
}
if (std->pl_virt) {
- if (std->dma_addr)
+ if (!dma_mapping_error(whc->wusbhc.dev, std->dma_addr))
dma_unmap_single(whc->wusbhc.dev, std->dma_addr,
std->num_pointers * sizeof(struct whc_page_list_entry),
DMA_TO_DEVICE);
@@ -535,9 +535,11 @@ static int qset_add_urb_sg(struct whc *whc, struct whc_qset *qset, struct urb *u
list_for_each_entry(std, &qset->stds, list_node) {
if (std->ntds_remaining == -1) {
pl_len = std->num_pointers * sizeof(struct whc_page_list_entry);
- std->ntds_remaining = ntds--;
std->dma_addr = dma_map_single(whc->wusbhc.dev, std->pl_virt,
pl_len, DMA_TO_DEVICE);
+ if (dma_mapping_error(whc->wusbhc.dev, std->dma_addr))
+ return -EFAULT;
+ std->ntds_remaining = ntds--;
}
}
return 0;
@@ -618,6 +620,8 @@ static int qset_add_urb_sg_linearize(struct whc *whc, struct whc_qset *qset,
std->dma_addr = dma_map_single(&whc->umc->dev, std->bounce_buf, std->len,
is_out ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
+ if (dma_mapping_error(&whc->umc->dev, std->dma_addr))
+ return -EFAULT;
if (qset_fill_page_list(whc, std, mem_flags) < 0)
return -ENOMEM;