diff options
| author | Chen Gang <gang.chen@asianux.com> | 2013-07-03 15:02:35 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:31 -0700 |
| commit | dacbde0963d62a4962d5e8a5cc38dfd1f016124b (patch) | |
| tree | d1ce35d0d3fc2307c1fbb6b35c17afc007d85afd | |
| parent | c53954a092d07c5684d31ea1fc813d262cff08a5 (diff) | |
mm/page_alloc.c: add additional checking and return value for the 'table->data'
- check the length of the procfs data before copying it into a fixed
size array.
- when __parse_numa_zonelist_order() fails, save the error code for
return.
- 'char*' --> 'char *' coding style fix
Signed-off-by: Chen Gang <gang.chen@asianux.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/page_alloc.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index fab9506273b..a662c74a0f5 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3256,18 +3256,25 @@ int numa_zonelist_order_handler(ctl_table *table, int write, static DEFINE_MUTEX(zl_order_mutex); mutex_lock(&zl_order_mutex); - if (write) - strcpy(saved_string, (char*)table->data); + if (write) { + if (strlen((char *)table->data) >= NUMA_ZONELIST_ORDER_LEN) { + ret = -EINVAL; + goto out; + } + strcpy(saved_string, (char *)table->data); + } ret = proc_dostring(table, write, buffer, length, ppos); if (ret) goto out; if (write) { int oldval = user_zonelist_order; - if (__parse_numa_zonelist_order((char*)table->data)) { + + ret = __parse_numa_zonelist_order((char *)table->data); + if (ret) { /* * bogus value. restore saved string */ - strncpy((char*)table->data, saved_string, + strncpy((char *)table->data, saved_string, NUMA_ZONELIST_ORDER_LEN); user_zonelist_order = oldval; } else if (oldval != user_zonelist_order) { |