Unverified Commit 243c0c15 authored Jan 09, 2025 by openeuler-ci-bot Committed by Gitee Jan 09, 2025

!14574 ALSA: pcm: Add sanity NULL check for the default mmap fault handler

Merge Pull Request from: @ci-robot 
 
PR sync from: Xiongfeng Wang <wangxiongfeng2@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/3MMSGCGXA6NMS6CAHCRPTHXQQH6ZRBOB/ 
 
https://gitee.com/src-openeuler/kernel/issues/IBEADU 
 
Link:https://gitee.com/openeuler/kernel/pulls/14574

 

Reviewed-by: Wang ShaoBo <bobo.shaobowang@huawei.com>
Signed-off-by: Zhang Peng <zhangpeng362@huawei.com>

parents d4501697 db635784

sound/core/pcm_native.c

+4 −2

Original line number	Diff line number	Diff line
		@@ -3794,9 +3794,11 @@ static vm_fault_t snd_pcm_mmap_data_fault(struct vm_fault *vmf)
		return VM_FAULT_SIGBUS;
		if (substream->ops->page)
		page = substream->ops->page(substream, offset);
		else if (!snd_pcm_get_dma_buf(substream))
		else if (!snd_pcm_get_dma_buf(substream)) {
		if (WARN_ON_ONCE(!runtime->dma_area))
		return VM_FAULT_SIGBUS;
		page = virt_to_page(runtime->dma_area + offset);
		else
		} else
		page = snd_sgbuf_get_page(snd_pcm_get_dma_buf(substream), offset);
		if (!page)
		return VM_FAULT_SIGBUS;