diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2017-09-30 11:15:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-04 10:39:28 +0200 |
| commit | 378f79cab12b669928f3a4037f023837ead2ce0c (patch) | |
| tree | 3c1e44ce1b50659550a0a956c2b81d7d8b778b69 /drivers/misc | |
| parent | a120fbddd59a3d04a63800824ea032dbf1c21b83 (diff) | |
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>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/pci_endpoint_test.c | 9 |
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) { |