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authorJiri Kosina <jkosina@suse.cz>2007-10-15 15:17:41 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-15 08:12:00 -0700
commit57d292bd7e6e72898e533687af481603597b1ca7 (patch)
treed9594d10bfc843b44eb4ad1b32f945b000330f8c /drivers/hid/hidraw.c
parent23fd50450a34f2558070ceabb0bfebc1c9604af5 (diff)
downloadlinux-2.6.38-lt-ux500-57d292bd7e6e72898e533687af481603597b1ca7.tar.gz
HID: fix HIDIOCGRDESC memory access in hidraw
Fix bogus copying of data into userspace when HIDIOCGRDESC is issued. HID-transport layer makes sure that dev->hid->rdesc is not larger than HID_MAX_DESCRIPTOR_SIZE. Noticed-by: Al Viro <viro@ftp.linux.org.uk> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/hid/hidraw.c')
-rw-r--r--drivers/hid/hidraw.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c
index 8503197a813..a702e2f6da7 100644
--- a/drivers/hid/hidraw.c
+++ b/drivers/hid/hidraw.c
@@ -229,9 +229,15 @@ static int hidraw_ioctl(struct inode *inode, struct file *file, unsigned int cmd
if (get_user(len, (int __user *)arg))
return -EFAULT;
- if (copy_to_user(*((__u8 **)(user_arg +
- sizeof(__u32))),
- dev->hid->rdesc, len))
+
+ if (len > HID_MAX_DESCRIPTOR_SIZE - 1)
+ return -EINVAL;
+
+ if (copy_to_user(user_arg + offsetof(
+ struct hidraw_report_descriptor,
+ value[0]),
+ dev->hid->rdesc,
+ min(dev->hid->rsize, len)))
return -EFAULT;
return 0;
}