From 85237f202d46d55c1bffe0c5b1aa3ddc0f1dce4d Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Tue, 21 Aug 2007 07:10:42 +0200 Subject: [PATCH] USB: fix DoS in pwc USB video driver the pwc driver has a disconnect method that waits for user space to close the device. This opens up an opportunity for a DoS attack, blocking the USB subsystem and making khubd's task busy wait in kernel space. This patch shifts freeing resources to close if an opened device is disconnected. Signed-off-by: Oliver Neukum CC: stable Signed-off-by: Greg Kroah-Hartman --- drivers/media/video/pwc/pwc-if.c | 52 +++++++++++++++++++++----------- drivers/media/video/pwc/pwc.h | 1 + 2 files changed, 36 insertions(+), 17 deletions(-) diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c index 9c0e8d18c2f6..3d81966d8c42 100644 --- a/drivers/media/video/pwc/pwc-if.c +++ b/drivers/media/video/pwc/pwc-if.c @@ -1196,12 +1196,19 @@ static int pwc_video_open(struct inode *inode, struct file *file) return 0; } + +static void pwc_cleanup(struct pwc_device *pdev) +{ + pwc_remove_sysfs_files(pdev->vdev); + video_unregister_device(pdev->vdev); +} + /* Note that all cleanup is done in the reverse order as in _open */ static int pwc_video_close(struct inode *inode, struct file *file) { struct video_device *vdev = file->private_data; struct pwc_device *pdev; - int i; + int i, hint; PWC_DEBUG_OPEN(">> video_close called(vdev = 0x%p).\n", vdev); @@ -1224,8 +1231,9 @@ static int pwc_video_close(struct inode *inode, struct file *file) pwc_isoc_cleanup(pdev); pwc_free_buffers(pdev); + lock_kernel(); /* Turn off LEDS and power down camera, but only when not unplugged */ - if (pdev->error_status != EPIPE) { + if (!pdev->unplugged) { /* Turn LEDs off */ if (pwc_set_leds(pdev, 0, 0) < 0) PWC_DEBUG_MODULE("Failed to set LED on/off time.\n"); @@ -1234,9 +1242,19 @@ static int pwc_video_close(struct inode *inode, struct file *file) if (i < 0) PWC_ERROR("Failed to power down camera (%d)\n", i); } + pdev->vopen--; + PWC_DEBUG_OPEN("<< video_close() vopen=%d\n", i); + } else { + pwc_cleanup(pdev); + /* Free memory (don't set pdev to 0 just yet) */ + kfree(pdev); + /* search device_hint[] table if we occupy a slot, by any chance */ + for (hint = 0; hint < MAX_DEV_HINTS; hint++) + if (device_hint[hint].pdev == pdev) + device_hint[hint].pdev = NULL; } - pdev->vopen--; - PWC_DEBUG_OPEN("<< video_close() vopen=%d\n", pdev->vopen); + unlock_kernel(); + return 0; } @@ -1791,21 +1809,21 @@ static void usb_pwc_disconnect(struct usb_interface *intf) /* Alert waiting processes */ wake_up_interruptible(&pdev->frameq); /* Wait until device is closed */ - while (pdev->vopen) - schedule(); - /* Device is now closed, so we can safely unregister it */ - PWC_DEBUG_PROBE("Unregistering video device in disconnect().\n"); - pwc_remove_sysfs_files(pdev->vdev); - video_unregister_device(pdev->vdev); - - /* Free memory (don't set pdev to 0 just yet) */ - kfree(pdev); + if(pdev->vopen) { + pdev->unplugged = 1; + } else { + /* Device is closed, so we can safely unregister it */ + PWC_DEBUG_PROBE("Unregistering video device in disconnect().\n"); + pwc_cleanup(pdev); + /* Free memory (don't set pdev to 0 just yet) */ + kfree(pdev); disconnect_out: - /* search device_hint[] table if we occupy a slot, by any chance */ - for (hint = 0; hint < MAX_DEV_HINTS; hint++) - if (device_hint[hint].pdev == pdev) - device_hint[hint].pdev = NULL; + /* search device_hint[] table if we occupy a slot, by any chance */ + for (hint = 0; hint < MAX_DEV_HINTS; hint++) + if (device_hint[hint].pdev == pdev) + device_hint[hint].pdev = NULL; + } unlock_kernel(); } diff --git a/drivers/media/video/pwc/pwc.h b/drivers/media/video/pwc/pwc.h index 910a04f53920..8e8e5b27e77e 100644 --- a/drivers/media/video/pwc/pwc.h +++ b/drivers/media/video/pwc/pwc.h @@ -193,6 +193,7 @@ struct pwc_device char vsnapshot; /* snapshot mode */ char vsync; /* used by isoc handler */ char vmirror; /* for ToUCaM series */ + char unplugged; int cmd_len; unsigned char cmd_buf[13];