Unverified Commit df85e99b authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!15129 comedi: Flush partial mappings in error case 

Merge Pull Request from: @ci-robot 
 
PR sync from: Chen Ridong <chenridong@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/NPRFLCFKM627SRXBAVLWAQHXW2ATRFZR/ 
 
https://gitee.com/src-openeuler/kernel/issues/IBDHGS 
 
Link:https://gitee.com/openeuler/kernel/pulls/15129

 

Reviewed-by: default avatarLi Nan <linan122@huawei.com>
Signed-off-by: default avatarLi Nan <linan122@huawei.com>
parents 3178f046 c9811b22

drivers/staging/comedi/comedi_fops.c

+12 −0
Original line number Original line Diff line number Diff line
@@ -2402,6 +2402,18 @@ static int comedi_mmap(struct file *file, struct vm_area_struct *vma) 




			start += PAGE_SIZE;

			start += PAGE_SIZE;

		}

		}



#ifdef CONFIG_MMU

		/*

		 * Leaving behind a partial mapping of a buffer we're about to

		 * drop is unsafe, see remap_pfn_range_notrack().

		 * We need to zap the range here ourselves instead of relying

		 * on the automatic zapping in remap_pfn_range() because we call

		 * remap_pfn_range() in a loop.

		 */

		if (retval)

			zap_vma_ptes(vma, vma->vm_start, size);

#endif

	}

	}





	if (retval == 0) {

	if (retval == 0) {