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Fix MapPCIBAR potential overflow.

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This commit is contained in:
Jonas 'Sortie' Termansen 2016-01-08 00:39:13 +01:00
parent 055f502c02
commit 48c6ccdf06
1 changed files with 3 additions and 4 deletions
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7
kernel/pci-mmio.cpp
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@ -79,22 +79,21 @@ bool MapPCIBAR(addralloc_t* allocation, pcibar_t bar, int flags)
bool failure = false;
int prot = PROT_KWRITE | PROT_KREAD;
uint64_t physaddr = bar.addr() + i;
uintptr_t mapat = allocation->from + i;
if ( sizeof(void*) <= 4 && 0x100000000 <= physaddr )
if ( sizeof(void*) <= 4 && 0x100000000 <= phys_addr + i )
errno = EOVERFLOW, failure = true;
#if defined(__i386__) || defined(__x86_64__)
else if ( flags & MAP_PCI_BAR_WRITE_COMBINE )
{
const addr_t mtype = Memory::PAT_WC;
if ( !Memory::MapPAT(physaddr, mapat, prot, mtype) )
if ( !Memory::MapPAT(phys_addr + i, mapat, prot, mtype) )
failure = true;
}
#endif
else
{
if ( !Memory::Map(physaddr, mapat, prot) )
if ( !Memory::Map(phys_addr + i, mapat, prot) )
failure = true;
}