Unverified Commit ea1d9d47 authored by openeuler-ci-bot's avatar openeuler-ci-bot Committed by Gitee
Browse files

!15578 scsi: target: tcmu: Fix possible page UAF 

Merge Pull Request from: @ci-robot 
 
PR sync from: Zheng Qixing <zhengqixing@huawei.com>
https://mailweb.openeuler.org/archives/list/kernel@openeuler.org/message/PZ3LCNVVUPKEBWXVL2O6ID6SMUVXUNCJ/ 
 
https://gitee.com/src-openeuler/kernel/issues/IBP6TV 
 
Link:https://gitee.com/openeuler/kernel/pulls/15578

 

Reviewed-by: default avatarYuan Can <yuancan@huawei.com>
Signed-off-by: default avatarYuan Can <yuancan@huawei.com>
parents 5624ca70 8847f1fd

drivers/target/target_core_user.c

+2 −1
Original line number Diff line number Diff line
@@ -1528,6 +1528,7 @@ static struct page *tcmu_try_get_block_page(struct tcmu_dev *udev, uint32_t dbi) 
	mutex_lock(&udev->cmdr_lock);

	page = tcmu_get_block_page(udev, dbi);

	if (likely(page)) {

		get_page(page);

		mutex_unlock(&udev->cmdr_lock);

		return page;

	}
@@ -1566,6 +1567,7 @@ static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 
		/* For the vmalloc()ed cmd area pages */

		addr = (void *)(unsigned long)info->mem[mi].addr + offset;

		page = vmalloc_to_page(addr);

		get_page(page);

	} else {

		uint32_t dbi;
@@ -1576,7 +1578,6 @@ static vm_fault_t tcmu_vma_fault(struct vm_fault *vmf) 
			return VM_FAULT_SIGBUS;

	}



	get_page(page);

	vmf->page = page;

	return 0;

}