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[media] omap_vout: Added check in reqbuf & mmap for buf_size allocation 

The usecase where, user allocates small size of buffer
through bootargs (video1_bufsize/video2_bufsize) and later from application
tries to set the format which requires larger buffer size, driver doesn't
check for insufficient buffer size and allows application to map extra buffer.
This leads to kernel crash, when user application tries to access memory
beyond the allocation size.

Added check in both mmap and reqbuf call back function,
and return error if the size of the buffer allocated by user through
bootargs is less than the S_FMT size.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Vaibhav Hiremath 2011-04-14 13:42:34 -03:00 committed by Mauro Carvalho Chehab
parent 8f3a307b9a
commit 383e4f6987
1 changed files with 16 additions and 0 deletions
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16
drivers/media/video/omap/omap_vout.c
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@ -982,6 +982,14 @@ static int omap_vout_buffer_setup(struct videobuf_queue *q, unsigned int *count,
startindex = (vout->vid == OMAP_VIDEO1) ?
video1_numbuffers : video2_numbuffers;
/* Check the size of the buffer */
if (*size > vout->buffer_size) {
v4l2_err(&vout->vid_dev->v4l2_dev,
"buffer allocation mismatch [%u] [%u]\n",
*size, vout->buffer_size);
return -ENOMEM;
}
for (i = startindex; i < *count; i++) {
vout->buffer_size = *size;
@ -1228,6 +1236,14 @@ static int omap_vout_mmap(struct file *file, struct vm_area_struct *vma)
(vma->vm_pgoff << PAGE_SHIFT));
return -EINVAL;
}
/* Check the size of the buffer */
if (size > vout->buffer_size) {
v4l2_err(&vout->vid_dev->v4l2_dev,
"insufficient memory [%lu] [%u]\n",
size, vout->buffer_size);
return -ENOMEM;
}
q->bufs[i]->baddr = vma->vm_start;
vma->vm_flags |= VM_RESERVED;