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| author | Emil Velikov <emil.l.velikov@gmail.com> | 2011-08-21 22:48:12 +0100 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2011-09-09 17:23:56 +1000 |
| commit | ffbc559b0699891c6deb9fd2b4750671eab94999 (patch) | |
| tree | eeb1dce1e2a809138353fdba7f81ad2d210a47a1 /drivers/gpu | |
| parent | ddf28352b80c86754a6424e3a61e8bdf9213b3c7 (diff) | |
| download | linux-ffbc559b0699891c6deb9fd2b4750671eab94999.tar.gz linux-ffbc559b0699891c6deb9fd2b4750671eab94999.tar.bz2 linux-ffbc559b0699891c6deb9fd2b4750671eab94999.zip | |
drm/nv50/crtc: Bail out if FB is not bound to crtc
Fixes possbile NULL pointer dereference
Resolves 'kernel crash in nv50_crtc_do_mode_set_base during shutdown'
https://bugs.freedesktop.org/show_bug.cgi?id=40005
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nv50_crtc.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/gpu/drm/nouveau/nv50_crtc.c b/drivers/gpu/drm/nouveau/nv50_crtc.c index 46ad59ea2185..5d989073ba6e 100644 --- a/drivers/gpu/drm/nouveau/nv50_crtc.c +++ b/drivers/gpu/drm/nouveau/nv50_crtc.c @@ -519,12 +519,18 @@ nv50_crtc_do_mode_set_base(struct drm_crtc *crtc, struct drm_device *dev = nv_crtc->base.dev; struct drm_nouveau_private *dev_priv = dev->dev_private; struct nouveau_channel *evo = nv50_display(dev)->master; - struct drm_framebuffer *drm_fb = nv_crtc->base.fb; - struct nouveau_framebuffer *fb = nouveau_framebuffer(drm_fb); + struct drm_framebuffer *drm_fb; + struct nouveau_framebuffer *fb; int ret; NV_DEBUG_KMS(dev, "index %d\n", nv_crtc->index); + /* no fb bound */ + if (!atomic && !crtc->fb) { + NV_DEBUG_KMS(dev, "No FB bound\n"); + return 0; + } + /* If atomic, we want to switch to the fb we were passed, so * now we update pointers to do that. (We don't pin; just * assume we're already pinned and update the base address.) @@ -533,6 +539,8 @@ nv50_crtc_do_mode_set_base(struct drm_crtc *crtc, drm_fb = passed_fb; fb = nouveau_framebuffer(passed_fb); } else { + drm_fb = crtc->fb; + fb = nouveau_framebuffer(crtc->fb); /* If not atomic, we can go ahead and pin, and unpin the * old fb we were passed. */ |