Driver core: fix show_uevent from taking up way too much stack
Declaring an array of PAGE_SIZE does bad things for people running with
4k stacks...
Thanks to Tilman Schmidt for tracking this down.
Cc: Tilman Schmidt <tilman@imap.cc>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8aa090d..59d9816 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -252,7 +252,7 @@
struct kobject *top_kobj;
struct kset *kset;
char *envp[32];
- char data[PAGE_SIZE];
+ char *data = NULL;
char *pos;
int i;
size_t count = 0;
@@ -276,6 +276,10 @@
if (!kset->uevent_ops->filter(kset, &dev->kobj))
goto out;
+ data = (char *)get_zeroed_page(GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
/* let the kset specific function add its keys */
pos = data;
retval = kset->uevent_ops->uevent(kset, &dev->kobj,
@@ -290,6 +294,7 @@
count += sprintf(pos, "%s\n", envp[i]);
}
out:
+ free_page((unsigned long)data);
return count;
}