Commit c6289378 authored by Arve Hjønnevåg's avatar Arve Hjønnevåg Committed by Anton Vorontsov
Browse files

pstore/ram: Fix bounds checks for mem_size, record_size, console_size and ftrace_size 



The bounds check in ramoops_init_prz was incorrect and ramoops_init_przs
had no check. Additionally, ramoops_init_przs allows record_size to be 0,
but ramoops_pstore_write_buf would always crash in this case.

Signed-off-by: default avatarArve Hjønnevåg <arve@android.com>
Signed-off-by: default avatarAnton Vorontsov <anton.vorontsov@linaro.org>
parent b042e474

fs/pstore/ram.c

+16 −2
Original line number Diff line number Diff line
@@ -189,7 +189,7 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, 
					    struct pstore_info *psi)

{

	struct ramoops_context *cxt = psi->data;

	struct persistent_ram_zone *prz = cxt->przs[cxt->dump_write_cnt];

	struct persistent_ram_zone *prz;

	size_t hlen;



	if (type == PSTORE_TYPE_CONSOLE) {
@@ -226,6 +226,11 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, 
	if (part != 1)

		return -ENOSPC;



	if (!cxt->przs)

		return -ENOSPC;



	prz = cxt->przs[cxt->dump_write_cnt];



	hlen = ramoops_write_kmsg_hdr(prz);

	if (size + hlen > prz->buffer_size)

		size = prz->buffer_size - hlen;
@@ -297,6 +302,11 @@ static int __devinit ramoops_init_przs(struct device *dev, 
	if (!cxt->record_size)

		return 0;



	if (*paddr + dump_mem_sz - cxt->phys_addr > cxt->size) {

		dev_err(dev, "no room for dumps\n");

		return -ENOMEM;

	}



	cxt->max_dump_cnt = dump_mem_sz / cxt->record_size;

	if (!cxt->max_dump_cnt)

		return -ENOMEM;
@@ -335,8 +345,12 @@ static int __devinit ramoops_init_prz(struct device *dev, 
	if (!sz)

		return 0;



	if (*paddr + sz > *paddr + cxt->size)

	if (*paddr + sz - cxt->phys_addr > cxt->size) {

		dev_err(dev, "no room for mem region (0x%zx@0x%llx) in (0x%lx@0x%llx)\n",

			sz, (unsigned long long)*paddr,

			cxt->size, (unsigned long long)cxt->phys_addr);

		return -ENOMEM;

	}



	*prz = persistent_ram_new(*paddr, sz, sig, cxt->ecc_size);

	if (IS_ERR(*prz)) {

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