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authorJiri Slaby <jslaby@suse.cz>2010-10-19 11:29:55 +0200
committerJiri Kosina <jkosina@suse.cz>2010-10-20 16:54:04 +0200
commitcb174681a9ececa6702f114b85bdf82144b6a5af (patch)
tree569ab434de51b3d323de65426f8cd55281b9e765 /drivers/hid
parenthugetlb, rmap: add BUG_ON(!PageLocked) in hugetlb_add_anon_rmap() (diff)
downloadlinux-cb174681a9ececa6702f114b85bdf82144b6a5af.tar.xz
linux-cb174681a9ececa6702f114b85bdf82144b6a5af.zip
HID: hidraw: fix window in hidraw_release
There is a window between hidraw_table check and its dereference. In that window, the device may be unplugged and removed form the system and we will then dereference NULL. Lock that place properly so that either we get NULL and jump out or we can work with real pointer. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hidraw.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 47d70c523d93..5a6f99b1db12 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -212,9 +212,13 @@ static int hidraw_release(struct inode * inode, struct file * file)
unsigned int minor = iminor(inode);
struct hidraw *dev;
struct hidraw_list *list = file->private_data;
+ int ret;
- if (!hidraw_table[minor])
- return -ENODEV;
+ mutex_lock(&minors_lock);
+ if (!hidraw_table[minor]) {
+ ret = -ENODEV;
+ goto unlock;
+ }
list_del(&list->node);
dev = hidraw_table[minor];
@@ -227,10 +231,12 @@ static int hidraw_release(struct inode * inode, struct file * file)
kfree(list->hidraw);
}
}
-
kfree(list);
+ ret = 0;
+unlock:
+ mutex_unlock(&minors_lock);
- return 0;
+ return ret;
}
static long hidraw_ioctl(struct file *file, unsigned int cmd,