From c7308c81a8220ab68eebfadde37db881a2800064 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Wed, 2 May 2007 14:14:11 +0200 Subject: [PATCH] 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 Cc: Kay Sievers Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/base/core.c b/drivers/base/core.c index 8aa090da1cd7..59d9816c332e 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -252,7 +252,7 @@ static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, 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 @@ static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, 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 @@ static ssize_t show_uevent(struct device *dev, struct device_attribute *attr, count += sprintf(pos, "%s\n", envp[i]); } out: + free_page((unsigned long)data); return count; } -- GitLab