89a0956683
On page unaligned frames, create_framevec forces get_vaddr_frames to
allocate an extra page at the end of the buffer. Under some
circumstances, this leads to -EINVAL on VIDIOC_QBUF.
E.g:
We have vm_a that vm_area that goes from 0x1000 to 0x3000. And a
frame that goes from 0x1800 to 0x2800, i.e. 2 pages.
frame_vector_create will be called with the following params:
get_vaddr_frames(0x1800, 2, write, 1, vec);
get_vaddr will allocate the first page after checking that the memory
0x1800-0x27ff is valid, but it will not allocate the second page because
the range 0x2800-0x37ff is out of the vm_a range. This results in
create_framevec returning -EFAULT
Error Trace:
[ 9083.793015] video0: VIDIOC_QBUF: 00:00:00.00000000 index=1,
type=vid-cap, flags=0x00002002, field=any, sequence=0,
memory=userptr, bytesused=0, offset/userptr=0x7ff2b023ca80, length=5765760
[ 9083.793028] timecode=00:00:00 type=0, flags=0x00000000,
frames=0, userbits=0x00000000
[ 9083.793117] video0: VIDIOC_QBUF: error -22: 00:00:00.00000000
index=2, type=vid-cap, flags=0x00000000, field=any, sequence=0,
memory=userptr, bytesused=0, offset/userptr=0x7ff2b07bc500, length=5765760
Also use true instead of 1 since that argument is a bool in the
get_vaddr_frames() prototype.
Fixes: 21fb0cb7ec ("[media] vb2: Provide helpers for mapping virtual addresses")
Reported-by: Albert Antony <albert@newtec.dk>
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
[hans.verkuil@cisco.com: merged the 'bool' change into this patch]
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: <stable@vger.kernel.org> # for v4.3 and up
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
/*
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* videobuf2-memops.c - generic memory handling routines for videobuf2
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Pawel Osciak <pawel@osciak.com>
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* Marek Szyprowski <m.szyprowski@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/dma-mapping.h>
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#include <linux/vmalloc.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/file.h>
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#include <media/videobuf2-v4l2.h>
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#include <media/videobuf2-memops.h>
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/**
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* vb2_create_framevec() - map virtual addresses to pfns
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* @start: Virtual user address where we start mapping
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* @length: Length of a range to map
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* @write: Should we map for writing into the area
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*
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* This function allocates and fills in a vector with pfns corresponding to
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* virtual address range passed in arguments. If pfns have corresponding pages,
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* page references are also grabbed to pin pages in memory. The function
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* returns pointer to the vector on success and error pointer in case of
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* failure. Returned vector needs to be freed via vb2_destroy_pfnvec().
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*/
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struct frame_vector *vb2_create_framevec(unsigned long start,
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unsigned long length,
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bool write)
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{
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int ret;
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unsigned long first, last;
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unsigned long nr;
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struct frame_vector *vec;
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first = start >> PAGE_SHIFT;
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last = (start + length - 1) >> PAGE_SHIFT;
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nr = last - first + 1;
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vec = frame_vector_create(nr);
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if (!vec)
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return ERR_PTR(-ENOMEM);
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ret = get_vaddr_frames(start & PAGE_MASK, nr, write, true, vec);
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if (ret < 0)
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goto out_destroy;
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/* We accept only complete set of PFNs */
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if (ret != nr) {
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ret = -EFAULT;
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goto out_release;
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}
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return vec;
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out_release:
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put_vaddr_frames(vec);
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out_destroy:
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frame_vector_destroy(vec);
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return ERR_PTR(ret);
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}
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EXPORT_SYMBOL(vb2_create_framevec);
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/**
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* vb2_destroy_framevec() - release vector of mapped pfns
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* @vec: vector of pfns / pages to release
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*
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* This releases references to all pages in the vector @vec (if corresponding
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* pfns are backed by pages) and frees the passed vector.
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*/
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void vb2_destroy_framevec(struct frame_vector *vec)
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{
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put_vaddr_frames(vec);
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frame_vector_destroy(vec);
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}
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EXPORT_SYMBOL(vb2_destroy_framevec);
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/**
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* vb2_common_vm_open() - increase refcount of the vma
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* @vma: virtual memory region for the mapping
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*
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* This function adds another user to the provided vma. It expects
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* struct vb2_vmarea_handler pointer in vma->vm_private_data.
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*/
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static void vb2_common_vm_open(struct vm_area_struct *vma)
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{
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struct vb2_vmarea_handler *h = vma->vm_private_data;
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pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n",
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__func__, h, atomic_read(h->refcount), vma->vm_start,
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vma->vm_end);
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atomic_inc(h->refcount);
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}
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/**
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* vb2_common_vm_close() - decrease refcount of the vma
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* @vma: virtual memory region for the mapping
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*
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* This function releases the user from the provided vma. It expects
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* struct vb2_vmarea_handler pointer in vma->vm_private_data.
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*/
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static void vb2_common_vm_close(struct vm_area_struct *vma)
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{
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struct vb2_vmarea_handler *h = vma->vm_private_data;
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pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n",
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__func__, h, atomic_read(h->refcount), vma->vm_start,
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vma->vm_end);
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h->put(h->arg);
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}
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/**
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* vb2_common_vm_ops - common vm_ops used for tracking refcount of mmaped
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* video buffers
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*/
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const struct vm_operations_struct vb2_common_vm_ops = {
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.open = vb2_common_vm_open,
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.close = vb2_common_vm_close,
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};
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EXPORT_SYMBOL_GPL(vb2_common_vm_ops);
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MODULE_DESCRIPTION("common memory handling routines for videobuf2");
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MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>");
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MODULE_LICENSE("GPL");
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