lkml.org 
[lkml]   [2020]   [Sep]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] dma-direct: Fix potential NULL pointer dereference
On Tue, Sep 15, 2020 at 08:03:14AM -0600, Thomas Tai wrote:
> When booting the kernel v5.9-rc4 on a VM, the kernel would panic when
> printing a warning message in swiotlb_map(). It is because dev->dma_mask
> can potentially be a null pointer. Using the dma_get_mask() macro can
> avoid the NULL pointer dereference.

dma_mask must not be zero. This means drm is calling DMA API functions
on something weird. This needs to be fixed in the caller.

\
 
 \ /
  Last update: 2020-09-16 02:28    [W:0.066 / U:1.960 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site