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final drm-fixes for 4.20

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array_index_nospec patch, cc: stable
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Merge tag 'drm-fixes-2018-12-21' of git://anongit.freedesktop.org/drm/drm

Pull final drm fix from Daniel Vetter:
 "Very calm week, so either everything perfect or everyone on holidays
  already. Just one array_index_nospec patch, also for stable"

* tag 'drm-fixes-2018-12-21' of git://anongit.freedesktop.org/drm/drm:
  drm/ioctl: Fix Spectre v1 vulnerabilities
This commit is contained in:
Linus Torvalds 2018-12-21 09:17:52 -08:00
commit 96d6ee7d2f
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/drm_ioctl.c
View File

@ -37,6 +37,7 @@
#include <linux/pci.h>
#include <linux/export.h>
#include <linux/nospec.h>
/**
* DOC: getunique and setversion story
@ -800,13 +801,17 @@ long drm_ioctl(struct file *filp,
if (is_driver_ioctl) {
/* driver ioctl */
if (nr - DRM_COMMAND_BASE >= dev->driver->num_ioctls)
unsigned int index = nr - DRM_COMMAND_BASE;
if (index >= dev->driver->num_ioctls)
goto err_i1;
ioctl = &dev->driver->ioctls[nr - DRM_COMMAND_BASE];
index = array_index_nospec(index, dev->driver->num_ioctls);
ioctl = &dev->driver->ioctls[index];
} else {
/* core ioctl */
if (nr >= DRM_CORE_IOCTL_COUNT)
goto err_i1;
nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
ioctl = &drm_ioctls[nr];
}
@ -888,6 +893,7 @@ bool drm_ioctl_flags(unsigned int nr, unsigned int *flags)
if (nr >= DRM_CORE_IOCTL_COUNT)
return false;
nr = array_index_nospec(nr, DRM_CORE_IOCTL_COUNT);
*flags = drm_ioctls[nr].flags;
return true;