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authorChen Gang <gang.chen@asianux.com>2013-07-03 15:02:35 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-07-03 16:07:31 -0700
commitdacbde0963d62a4962d5e8a5cc38dfd1f016124b (patch)
treed1ce35d0d3fc2307c1fbb6b35c17afc007d85afd /mm
parentc53954a092d07c5684d31ea1fc813d262cff08a5 (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>
Diffstat (limited to 'mm')
-rw-r--r--mm/page_alloc.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fab9506273be..a662c74a0f5d 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) {