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misc: pci_endpoint_test: Prevent some integer overflows

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

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

Add a few checks to prevent that.

Fixes: 13107c6068 ("misc: pci_endpoint_test: Add support to provide aligned buffer addresses")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Dan Carpenter 2017-09-30 11:15:52 +03:00 committed by Bjorn Helgaas
parent 9e66317d3c
commit 343dc693f7
1 changed files with 9 additions and 0 deletions
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9
drivers/misc/pci_endpoint_test.c
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@ -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) {