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usb: host: ehci-sched: Use struct_size() in kzalloc()

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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 worse scenario, could lead to heap overflows.

Also, address the following sparse warning:
drivers/usb/host/ehci-sched.c:1168:40: warning: using sizeof on a flexible structure

Link: https://github.com/KSPP/linux/issues/160
Link: https://github.com/KSPP/linux/issues/174
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20220111075427.GA76390@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2022-01-11 01:54:27 -06:00 committed by Greg Kroah-Hartman
parent e783362eb5
commit 75c19f487f
1 changed files with 1 additions and 3 deletions
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4
drivers/usb/host/ehci-sched.c
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@ -1165,10 +1165,8 @@ static struct ehci_iso_sched *
iso_sched_alloc(unsigned packets, gfp_t mem_flags)
{
struct ehci_iso_sched *iso_sched;
int size = sizeof(*iso_sched);
size += packets * sizeof(struct ehci_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);