[PATCH 4.14 051/105] misc: pci_endpoint_test: Prevent some integer overflows

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

commit 378f79cab12b669928f3a4037f023837ead2ce0c upstream

"size + max" can have an arithmetic overflow when we're allocating:

	orig_src_addr = dma_alloc_coherent(dev, size + alignment, ...

I've added a few checks to prevent that.

Fixes: 13107c60681f ("misc: pci_endpoint_test: Add support to provide aligned buffer addresses")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/misc/pci_endpoint_test.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -226,6 +226,9 @@ static bool pci_endpoint_test_copy(struc
 	u32 src_crc32;
 	u32 dst_crc32;
 
+	if (size > SIZE_MAX - alignment)
+		goto err;
+
 	orig_src_addr = dma_alloc_coherent(dev, size + alignment,
 					   &orig_src_phys_addr, GFP_KERNEL);
 	if (!orig_src_addr) {
@@ -311,6 +314,9 @@ static bool pci_endpoint_test_write(stru
 	size_t alignment = test->alignment;
 	u32 crc32;
 
+	if (size > SIZE_MAX - alignment)
+		goto err;
+
 	orig_addr = dma_alloc_coherent(dev, size + alignment, &orig_phys_addr,
 				       GFP_KERNEL);
 	if (!orig_addr) {
@@ -369,6 +375,9 @@ static bool pci_endpoint_test_read(struc
 	size_t alignment = test->alignment;
 	u32 crc32;
 
+	if (size > SIZE_MAX - alignment)
+		goto err;
+
 	orig_addr = dma_alloc_coherent(dev, size + alignment, &orig_phys_addr,
 				       GFP_KERNEL);
 	if (!orig_addr) {