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| author | Greg Kroah-Hartman <gregkh@suse.de> | 2007-05-02 14:14:11 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-05-02 18:57:59 -0700 |
| commit | c7308c81a8220ab68eebfadde37db881a2800064 (patch) | |
| tree | 3858df7cc85b4bf84c8c1dc2157c425286c2c386 /drivers/base | |
| parent | dc87c3985e9b442c60994308a96f887579addc39 (diff) | |
| download | lwn-c7308c81a8220ab68eebfadde37db881a2800064.tar.gz lwn-c7308c81a8220ab68eebfadde37db881a2800064.zip | |
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.c | 7 |
1 files changed, 6 insertions, 1 deletions
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; } |