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iommu/io-pgtable-arm-v7s: Add error handle for page table allocation failure

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In __arm_v7s_alloc_table function:
iommu call kmem_cache_alloc to allocate page table, this function
allocate memory may fail, when kmem_cache_alloc fails to allocate
table, call virt_to_phys will be abnomal and return unexpected phys
and goto out_free, then call kmem_cache_free to release table will
trigger KE, __get_free_pages and free_pages have similar problem,
so add error handle for page table allocation failure.

Fixes: 29859aeb8a ("iommu/io-pgtable-arm-v7s: Abort allocation when table address overflows the PTE")
Signed-off-by: Yunfei Wang <yf.wang@mediatek.com>
Cc: <stable@vger.kernel.org> # 5.10.*
Acked-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/20211207113315.29109-1-yf.wang@mediatek.com
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Yunfei Wang 2021-12-07 19:33:15 +08:00 committed by Will Deacon
parent 17d9a4b43b
commit a556cfe4ca
1 changed files with 5 additions and 1 deletions
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6
drivers/iommu/io-pgtable-arm-v7s.c
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@ -246,13 +246,17 @@ static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp,
__GFP_ZERO | ARM_V7S_TABLE_GFP_DMA, get_order(size));
else if (lvl == 2)
table = kmem_cache_zalloc(data->l2_tables, gfp);
if (!table)
return NULL;
phys = virt_to_phys(table);
if (phys != (arm_v7s_iopte)phys) {
/* Doesn't fit in PTE */
dev_err(dev, "Page table does not fit in PTE: %pa", &phys);
goto out_free;
}
if (table && !cfg->coherent_walk) {
if (!cfg->coherent_walk) {
dma = dma_map_single(dev, table, size, DMA_TO_DEVICE);
if (dma_mapping_error(dev, dma))
goto out_free;