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acpidump: do not use pointer arithmetic to check for overflow

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PR:	204945

(cherry picked from commit 8c108dccd7)
This commit is contained in:
Konstantin Belousov 2025-02-26 07:24:30 +02:00
parent 9383629ffc
commit 8ebb0781f5
1 changed files with 5 additions and 4 deletions
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9
usr.sbin/acpi/acpidump/acpi.c
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@ -1222,13 +1222,14 @@ acpi_handle_tcpa(ACPI_TABLE_HEADER *sdp)
vend = vaddr + len;
while (vaddr != NULL) {
if ((vaddr + sizeof(struct TCPAevent) >= vend)||
(vaddr + sizeof(struct TCPAevent) < vaddr))
if ((uintptr_t)vaddr + sizeof(struct TCPAevent) >=
(uintptr_t)vend || (uintptr_t)vaddr + sizeof(
struct TCPAevent) < (uintptr_t)vaddr)
break;
event = (struct TCPAevent *)(void *)vaddr;
if (vaddr + event->event_size >= vend)
if ((uintptr_t)vaddr + event->event_size >= (uintptr_t)vend)
break;
if (vaddr + event->event_size < vaddr)
if ((uintptr_t)vaddr + event->event_size < (uintptr_t)vaddr)
break;
if (event->event_type == 0 && event->event_size == 0)
break;