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53 lines
1.6 KiB
Diff
53 lines
1.6 KiB
Diff
From 24b51892b863ad23a9fcb2a28a45e5cc15c2f3b5 Mon Sep 17 00:00:00 2001
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From: Manoj Rao <manojraj@codeaurora.org>
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Date: Tue, 16 Apr 2013 17:42:38 -0700
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Subject: mdss: mdss_fb: remove mmio access through mmap
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Disable access to mm io and add
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appropriate range checks to ensure valid accesses
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through framebuffer mmap. This prevents illegal
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access into memory.
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Change-Id: Ic6e47ec726d330d48ce9a7a708418492a553543b
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CRs-Fixed: 474706
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Signed-off-by: Manoj Rao <manojraj@codeaurora.org>
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---
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drivers/video/msm/mdss/mdss_fb.c | 16 +++++-----------
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1 file changed, 5 insertions(+), 11 deletions(-)
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diff --git a/drivers/video/msm/mdss/mdss_fb.c b/drivers/video/msm/mdss/mdss_fb.c
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index e2d8cf6..f42df2a 100644
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--- a/drivers/video/msm/mdss/mdss_fb.c
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+++ b/drivers/video/msm/mdss/mdss_fb.c
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@@ -669,22 +669,16 @@ static int mdss_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
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}
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mdss_fb_pan_idle(mfd);
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- if (off >= len) {
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- /* memory mapped io */
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- off -= len;
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- if (info->var.accel_flags) {
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- mutex_unlock(&info->lock);
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- return -EINVAL;
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- }
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- start = info->fix.mmio_start;
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- len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
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- }
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/* Set VM flags. */
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start &= PAGE_MASK;
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- if ((vma->vm_end - vma->vm_start + off) > len)
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+ if ((vma->vm_end <= vma->vm_start) ||
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+ (off >= len) ||
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+ ((vma->vm_end - vma->vm_start) > (len - off)))
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return -EINVAL;
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off += start;
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+ if (off < start)
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+ return -EINVAL;
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vma->vm_pgoff = off >> PAGE_SHIFT;
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/* This is an IO map - tell maydump to skip this VMA */
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vma->vm_flags |= VM_IO | VM_RESERVED;
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--
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cgit v1.1
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