From 305325688ff924c52a6e12f92235a89536e022cf Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Thu, 20 Jan 2022 17:02:47 -0600 Subject: NTB/msi: Use struct_size() helper in devm_kzalloc() Make use of the struct_size() helper instead of an open-coded version, in order to avoid any potential type mistakes or integer overflows that, in the worst scenario, could lead to heap overflows. Also, address the following sparse warnings: drivers/ntb/msi.c:46:23: warning: using sizeof on a flexible structure Link: https://github.com/KSPP/linux/issues/174 Signed-off-by: Gustavo A. R. Silva Reviewed-by: Kees Cook Reviewed-by: Logan Gunthorpe Signed-off-by: Jon Mason --- drivers/ntb/msi.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) (limited to 'drivers/ntb') diff --git a/drivers/ntb/msi.c b/drivers/ntb/msi.c index dd683cb58d09..6295e55ef85e 100644 --- a/drivers/ntb/msi.c +++ b/drivers/ntb/msi.c @@ -33,7 +33,6 @@ int ntb_msi_init(struct ntb_dev *ntb, { phys_addr_t mw_phys_addr; resource_size_t mw_size; - size_t struct_size; int peer_widx; int peers; int ret; @@ -43,9 +42,8 @@ int ntb_msi_init(struct ntb_dev *ntb, if (peers <= 0) return -EINVAL; - struct_size = sizeof(*ntb->msi) + sizeof(*ntb->msi->peer_mws) * peers; - - ntb->msi = devm_kzalloc(&ntb->dev, struct_size, GFP_KERNEL); + ntb->msi = devm_kzalloc(&ntb->dev, struct_size(ntb->msi, peer_mws, peers), + GFP_KERNEL); if (!ntb->msi) return -ENOMEM; -- cgit v1.2.3-59-g8ed1b