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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2019-04-17 18:29:15 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-04-21 23:12:39 +1000 |
| commit | e09093927e54323018dbb3bf6189c85a7f176bae (patch) | |
| tree | 46707f04e29140d7f1213650c616277a64fa7bec /arch/powerpc/mm/pgtable-hash64.c | |
| parent | 0034d395f89d9c092bb15adbabdca5283e258b41 (diff) | |
| download | kernel_replicant_linux-e09093927e54323018dbb3bf6189c85a7f176bae.tar.gz kernel_replicant_linux-e09093927e54323018dbb3bf6189c85a7f176bae.tar.bz2 kernel_replicant_linux-e09093927e54323018dbb3bf6189c85a7f176bae.zip | |
powerpc/mm: Validate address values against different region limits
This adds an explicit check in various functions.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pgtable-hash64.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable-hash64.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/arch/powerpc/mm/pgtable-hash64.c b/arch/powerpc/mm/pgtable-hash64.c index c08d49046a96..d934de4e2b3a 100644 --- a/arch/powerpc/mm/pgtable-hash64.c +++ b/arch/powerpc/mm/pgtable-hash64.c @@ -112,9 +112,16 @@ int __meminit hash__vmemmap_create_mapping(unsigned long start, unsigned long page_size, unsigned long phys) { - int rc = htab_bolt_mapping(start, start + page_size, phys, - pgprot_val(PAGE_KERNEL), - mmu_vmemmap_psize, mmu_kernel_ssize); + int rc; + + if ((start + page_size) >= H_VMEMMAP_END) { + pr_warn("Outisde the supported range\n"); + return -1; + } + + rc = htab_bolt_mapping(start, start + page_size, phys, + pgprot_val(PAGE_KERNEL), + mmu_vmemmap_psize, mmu_kernel_ssize); if (rc < 0) { int rc2 = htab_remove_mapping(start, start + page_size, mmu_vmemmap_psize, |