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USB: usbfs: fix mmap dma mismatch 

In commit 2bef9aed6f ("usb: usbfs: correct kernel->user page attribute
mismatch") we switched from always calling remap_pfn_range() to call
dma_mmap_coherent() to handle issues with systems with non-coherent USB host
controller drivers.  Unfortunatly, as syzbot quickly told us, not all the world
is host controllers with DMA support, so we need to check what host controller
we are attempting to talk to before doing this type of allocation.

Thanks to Christoph for the quick idea of how to fix this.

Fixes: 2bef9aed6f ("usb: usbfs: correct kernel->user page attribute mismatch")
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: stable <stable@vger.kernel.org>
Reported-by: syzbot+353be47c9ce21b68b7ed@syzkaller.appspotmail.com
Reviewed-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20200514112711.1858252-1-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2020-05-14 13:27:11 +02:00
parent 1449cb2c22
commit a0e710a7de
1 changed files with 13 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/usb/core/devio.c
View File

@ -251,9 +251,19 @@ static int usbdev_mmap(struct file *file, struct vm_area_struct *vma)
usbm->vma_use_count = 1;
INIT_LIST_HEAD(&usbm->memlist);
if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle, size)) {
dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
return -EAGAIN;
if (hcd->localmem_pool || !hcd_uses_dma(hcd)) {
if (remap_pfn_range(vma, vma->vm_start,
virt_to_phys(usbm->mem) >> PAGE_SHIFT,
size, vma->vm_page_prot) < 0) {
dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
return -EAGAIN;
}
} else {
if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle,
size)) {
dec_usb_memory_use_count(usbm, &usbm->vma_use_count);
return -EAGAIN;
}
}
vma->vm_flags |= VM_IO;