diff options
| author | Thomas Hellstrom <thellstrom@vmware.com> | 2012-01-24 18:54:21 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-02-03 09:18:52 -0800 |
| commit | 90af660bec3b2d47e17cb3caae742810656e2d4f (patch) | |
| tree | e8f4d93c7386c19dd9b50156696b4447ba7877d6 /include/drm | |
| parent | c196878589eb5f88e244a557a55b229a3c285b3b (diff) | |
drm: Fix authentication kernel crash
commit 598781d71119827b454fd75d46f84755bca6f0c6 upstream.
If the master tries to authenticate a client using drm_authmagic and
that client has already closed its drm file descriptor,
either wilfully or because it was terminated, the
call to drm_authmagic will dereference a stale pointer into kmalloc'ed memory
and corrupt it.
Typically this results in a hard system hang.
This patch fixes that problem by removing any authentication tokens
(struct drm_magic_entry) open for a file descriptor when that file
descriptor is closed.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drmP.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/drm/drmP.h b/include/drm/drmP.h index 738b3a5faa1..40aaebf50af 100644 --- a/include/drm/drmP.h +++ b/include/drm/drmP.h @@ -1323,6 +1323,7 @@ extern int drm_getmagic(struct drm_device *dev, void *data, struct drm_file *file_priv); extern int drm_authmagic(struct drm_device *dev, void *data, struct drm_file *file_priv); +extern int drm_remove_magic(struct drm_master *master, drm_magic_t magic); /* Cache management (drm_cache.c) */ void drm_clflush_pages(struct page *pages[], unsigned long num_pages); |