| Message ID | 20220120222043.GA33559@embeddedor |
|---|---|
| State | New |
| Headers | show |
| Series | [next] usb: host: fotg210: Use struct_size() helper in kzalloc() | expand |
On Thu, Jan 20, 2022 at 04:20:43PM -0600, Gustavo A. R. Silva wrote: > 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/usb/host/fotg210-hcd.c:4017:20: warning: using sizeof on a flexible structure > > Link: https://github.com/KSPP/linux/issues/174 > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> Good-bye more open-coded calculations. :) Reviewed-by: Kees Cook <keescook@chromium.org>
diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c index 7af17c8e069b..c3fd375b4778 100644 --- a/drivers/usb/host/fotg210-hcd.c +++ b/drivers/usb/host/fotg210-hcd.c @@ -4014,10 +4014,8 @@ static struct fotg210_iso_sched *iso_sched_alloc(unsigned packets, gfp_t mem_flags) { struct fotg210_iso_sched *iso_sched; - int size = sizeof(*iso_sched); - size += packets * sizeof(struct fotg210_iso_packet); - iso_sched = kzalloc(size, mem_flags); + iso_sched = kzalloc(struct_size(iso_sched, packet, packets), mem_flags); if (likely(iso_sched != NULL)) INIT_LIST_HEAD(&iso_sched->td_list);
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/usb/host/fotg210-hcd.c:4017:20: warning: using sizeof on a flexible structure Link: https://github.com/KSPP/linux/issues/174 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> --- drivers/usb/host/fotg210-hcd.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)