diff options
| author | Dan Carpenter <dan.carpenter@oracle.com> | 2017-05-08 15:55:14 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-08 17:15:10 -0700 |
| commit | 146180c052a00172f4dc08eaade836fd02f61fb5 (patch) | |
| tree | be2f06a42ba18154515a2efb78db06e14db5201a | |
| parent | 780cbcf28781511d2cb235c375127265209796a8 (diff) | |
drivers/misc/vmw_vmci/vmci_queue_pair.c: fix a couple integer overflow tests
The "DIV_ROUND_UP(size, PAGE_SIZE)" operation can overflow if "size" is
more than ULLONG_MAX - PAGE_SIZE.
Link: http://lkml.kernel.org/r/20170322111950.GA11279@mwanda
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Jorgen Hansen <jhansen@vmware.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/misc/vmw_vmci/vmci_queue_pair.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c index 498c0854305f..06c4974ee8dd 100644 --- a/drivers/misc/vmw_vmci/vmci_queue_pair.c +++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c @@ -298,8 +298,11 @@ static void *qp_alloc_queue(u64 size, u32 flags) size_t pas_size; size_t vas_size; size_t queue_size = sizeof(*queue) + sizeof(*queue->kernel_if); - const u64 num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1; + u64 num_pages; + if (size > SIZE_MAX - PAGE_SIZE) + return NULL; + num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1; if (num_pages > (SIZE_MAX - queue_size) / (sizeof(*queue->kernel_if->u.g.pas) + @@ -624,9 +627,12 @@ static struct vmci_queue *qp_host_alloc_queue(u64 size) { struct vmci_queue *queue; size_t queue_page_size; - const u64 num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1; + u64 num_pages; const size_t queue_size = sizeof(*queue) + sizeof(*(queue->kernel_if)); + if (size > SIZE_MAX - PAGE_SIZE) + return NULL; + num_pages = DIV_ROUND_UP(size, PAGE_SIZE) + 1; if (num_pages > (SIZE_MAX - queue_size) / sizeof(*queue->kernel_if->u.h.page)) return NULL; |