4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> [ Upstream commit 146180c052a00172f4dc08eaade836fd02f61fb5 ] 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@xxxxxxxxxx> Cc: Jorgen Hansen <jhansen@xxxxxxxxxx> Cc: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> Cc: Michal Hocko <mhocko@xxxxxxxx> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/misc/vmw_vmci/vmci_queue_pair.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) --- 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, u3 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_ { 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;