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authorArve Hjønnevåg <arve@android.com>2012-12-11 17:49:24 -0800
committerAnton Vorontsov <anton.vorontsov@linaro.org>2012-12-12 19:02:52 -0800
commitc628937803c652132d21f383736375e2feee4bfb (patch)
tree41ebffb3fe0b787c34ba2c45f860336f5d27e0ca /fs
parentb042e47491ba5f487601b5141a3f1d8582304170 (diff)
downloadlinux-c628937803c652132d21f383736375e2feee4bfb.tar.bz2
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: Arve Hjønnevåg <arve@android.com> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/pstore/ram.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index 8741cea6253c..dba70e53b72c 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -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)) {