From d0b8ed47e83a2253897500ea4fcae8e8198942b4 Mon Sep 17 00:00:00 2001 From: pierre Kuo Date: Tue, 19 Feb 2019 15:45:00 +0800 Subject: of: reserved_mem: fix reserve memory leak The __reserved_mem_init_node will call region specific reserved memory init codes, but once all compatibled init codes failed, the memory region will left in memory.reserved and cause leakage. Take cma reserve memory DTS for example, if user declare 1MB size, which is not align to (PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order)), rmem_cma_setup will return -EINVAL. Meanwhile, rmem_dma_setup will also return -EINVAL since "reusable" property is not set. If finally there is no reserved memory init pick up this memory, kernel will left the 1MB leak in memory.reserved. This patch will remove this kind of memory from memory.reserved, only when __reserved_mem_init_node return neither 0 nor -ENOENT. Signed-off-by: pierre Kuo Signed-off-by: Rob Herring --- drivers/of/of_reserved_mem.c | 22 +++++++++++++++++----- 1 file changed, 17 insertions(+), 5 deletions(-) (limited to 'drivers/of') diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c index 6a36bc0b3d64..89e190e94af7 100644 --- a/drivers/of/of_reserved_mem.c +++ b/drivers/of/of_reserved_mem.c @@ -171,6 +171,7 @@ static int __init __reserved_mem_init_node(struct reserved_mem *rmem) { extern const struct of_device_id __reservedmem_of_table[]; const struct of_device_id *i; + int ret = -ENOENT; for (i = __reservedmem_of_table; i < &__rmem_of_table_sentinel; i++) { reservedmem_of_init_fn initfn = i->data; @@ -179,13 +180,14 @@ static int __init __reserved_mem_init_node(struct reserved_mem *rmem) if (!of_flat_dt_is_compatible(rmem->fdt_node, compat)) continue; - if (initfn(rmem) == 0) { + ret = initfn(rmem); + if (ret == 0) { pr_info("initialized node %s, compatible id %s\n", rmem->name, compat); - return 0; + break; } } - return -ENOENT; + return ret; } static int __init __rmem_cmp(const void *a, const void *b) @@ -245,7 +247,9 @@ void __init fdt_init_reserved_mem(void) int len; const __be32 *prop; int err = 0; + int nomap; + nomap = of_get_flat_dt_prop(node, "no-map", NULL) != NULL; prop = of_get_flat_dt_prop(node, "phandle", &len); if (!prop) prop = of_get_flat_dt_prop(node, "linux,phandle", &len); @@ -255,8 +259,16 @@ void __init fdt_init_reserved_mem(void) if (rmem->size == 0) err = __reserved_mem_alloc_size(node, rmem->name, &rmem->base, &rmem->size); - if (err == 0) - __reserved_mem_init_node(rmem); + if (err == 0) { + err = __reserved_mem_init_node(rmem); + if (err != 0 && err != -ENOENT) { + pr_info("node %s compatible matching fail\n", + rmem->name); + memblock_free(rmem->base, rmem->size); + if (nomap) + memblock_add(rmem->base, rmem->size); + } + } } } -- cgit v1.2.3