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authorGreg Kroah-Hartman <gregkh@suse.de>2007-05-02 14:14:11 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2007-05-02 18:57:59 -0700
commitc7308c81a8220ab68eebfadde37db881a2800064 (patch)
tree3858df7cc85b4bf84c8c1dc2157c425286c2c386 /drivers/base
parentdc87c3985e9b442c60994308a96f887579addc39 (diff)
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>
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/core.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 8aa090da1cd..59d9816c332 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;
}