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IEEE 1394 (FireWire) subsystem fix: The character device file interface for

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raw 1394 I/O took uninitialized kernel stack as substitute for missing ioctl()
 argument data.  This could partially show up in subsequent read() output.
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Merge tag 'firewire-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394

Pull firewire fix from Stefan Richter:
 "IEEE 1394 (FireWire) subsystem fix: The character device file
  interface for raw 1394 I/O took uninitialized kernel stack as
  substitute for missing ioctl() argument data.  This could partially
  show up in subsequent read() output"

* tag 'firewire-fix' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394:
  firewire: cdev: prevent kernel stack leaking into ioctl arguments
This commit is contained in:
Linus Torvalds 2014-11-14 12:44:48 -08:00
parent 3865efcb14 eaca2d8e75
commit f720d7df99
1 changed files with 1 additions and 2 deletions
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3
drivers/firewire/core-cdev.c
View file

@ -1637,8 +1637,7 @@ static int dispatch_ioctl(struct client *client,
_IOC_SIZE(cmd) > sizeof(buffer))
return -ENOTTY;
if (_IOC_DIR(cmd) == _IOC_READ)
memset(&buffer, 0, _IOC_SIZE(cmd));
memset(&buffer, 0, sizeof(buffer));
if (_IOC_DIR(cmd) & _IOC_WRITE)
if (copy_from_user(&buffer, arg, _IOC_SIZE(cmd)))