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authorDan Carpenter <dan.carpenter@oracle.com>2018-07-03 15:29:21 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2018-07-03 15:06:15 +0200
commitde10eba0f68a161f3176b710b6e27d291d48aac2 (patch)
treef8e74c76821b6ee47c37d7d7da906d762cd57006
parenta1de8d0a7e2cc79dad6d469901b3b5d4c94c4554 (diff)
downloadlinux-de10eba0f68a161f3176b710b6e27d291d48aac2.tar.bz2
drm/vgem: off by one in vgem_gem_fault()
If page_offset is == num_pages then we end up reading beyond the end of obj->pages[]. Fixes: af33a9190d02 ("drm/vgem: Enable dmabuf import interfaces") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180703122921.brlfxl4vx2ybvrd2@kili.mountain
-rw-r--r--drivers/gpu/drm/vgem/vgem_drv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c
index c64a85950c82..0e5620f76ee0 100644
--- a/drivers/gpu/drm/vgem/vgem_drv.c
+++ b/drivers/gpu/drm/vgem/vgem_drv.c
@@ -74,7 +74,7 @@ static vm_fault_t vgem_gem_fault(struct vm_fault *vmf)
num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
- if (page_offset > num_pages)
+ if (page_offset >= num_pages)
return VM_FAULT_SIGBUS;
mutex_lock(&obj->pages_lock);