Commit d4526a2d authored by Thomas Weißschuh's avatar Thomas Weißschuh Committed by Thomas Gleixner
Browse files

powerpc/procfs: Propagate error of remap_pfn_range() 



If the operation fails and userspace is unaware it will access unmapped
memory, crashing the process.

Signed-off-by: default avatarThomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-22-b64f0842d512@linutronix.de
parent e449c83a

arch/powerpc/kernel/proc_powerpc.c

+3 −4
Original line number Diff line number Diff line
@@ -33,10 +33,9 @@ static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) 
	if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)

		return -EINVAL;



	remap_pfn_range(vma, vma->vm_start,

	return remap_pfn_range(vma, vma->vm_start,

			       __pa(pde_data(file_inode(file))) >> PAGE_SHIFT,

			       PAGE_SIZE, vma->vm_page_prot);

	return 0;

}



static const struct proc_ops page_map_proc_ops = {