misc: pci_endpoint_test: Prevent some integer overflows

"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@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index deb203026496..c0d323077ad0 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -226,6 +226,9 @@ static bool pci_endpoint_test_copy(struct pci_endpoint_test *test, size_t size)
         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(struct pci_endpoint_test *test, size_t size)
         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(struct pci_endpoint_test *test, size_t size)
         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) {