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media: vb2: vb2_mmap: move lock up

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commit cd26d1c4d1 upstream.

If a filehandle is dup()ped, then it is possible to close it from one fd
and call mmap from the other. This creates a race condition in vb2_mmap
where it is using queue data that __vb2_queue_free (called from close())
is in the process of releasing.

By moving up the mutex_lock(mmap_lock) in vb2_mmap this race is avoided
since __vb2_queue_free is called with the same mutex locked. So vb2_mmap
now reads consistent buffer data.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Reported-by: syzbot+be93025dd45dccd8923c@syzkaller.appspotmail.com
Signed-off-by: Hans Verkuil <hansverk@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hans Verkuil
2018-11-13 09:06:46 -05:00
committed by Greg Kroah-Hartman
parent b9f9379336
commit eb376a62ac
1 changed files with 8 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/media/v4l2-core/videobuf2-core.c
View File

@@ -1925,9 +1925,13 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
return -EINVAL;
}
}
mutex_lock(&q->mmap_lock);
if (vb2_fileio_is_active(q)) {
dprintk(1, "mmap: file io in progress\n");
return -EBUSY;
ret = -EBUSY;
goto unlock;
}
/*
@@ -1935,7 +1939,7 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
*/
ret = __find_plane_by_offset(q, off, &buffer, &plane);
if (ret)
return ret;
goto unlock;
vb = q->bufs[buffer];
@@ -1951,8 +1955,9 @@ int vb2_mmap(struct vb2_queue *q, struct vm_area_struct *vma)
return -EINVAL;
}
mutex_lock(&q->mmap_lock);
ret = call_memop(vb, mmap, vb->planes[plane].mem_priv, vma);
unlock:
mutex_unlock(&q->mmap_lock);
if (ret)
return ret;