Make use of the struct_size() and flex_array_size() helpers instead of open-coded versions, in order to avoid any potential type mistakes or integer overflows that, in the worse scenario, could lead to heap overflows. Link: https://github.com/KSPP/linux/issues/160 Signed-off-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx> --- drivers/infiniband/hw/hfi1/user_exp_rcv.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/hw/hfi1/user_exp_rcv.c b/drivers/infiniband/hw/hfi1/user_exp_rcv.c index 0c86e9d354f8..186d30291260 100644 --- a/drivers/infiniband/hw/hfi1/user_exp_rcv.c +++ b/drivers/infiniband/hw/hfi1/user_exp_rcv.c @@ -692,8 +692,7 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd, * Allocate the node first so we can handle a potential * failure before we've programmed anything. */ - node = kzalloc(sizeof(*node) + (sizeof(struct page *) * npages), - GFP_KERNEL); + node = kzalloc(struct_size(node, pages, npages), GFP_KERNEL); if (!node) return -ENOMEM; @@ -713,7 +712,7 @@ static int set_rcvarray_entry(struct hfi1_filedata *fd, node->dma_addr = phys; node->grp = grp; node->freed = false; - memcpy(node->pages, pages, sizeof(struct page *) * npages); + memcpy(node->pages, pages, flex_array_size(node, pages, npages)); if (fd->use_mn) { ret = mmu_interval_notifier_insert( -- 2.27.0
