From: Thomas Weißschuh Date: Thu, 10 Oct 2024 07:01:24 +0000 (+0200) Subject: powerpc/procfs: Propagate error of remap_pfn_range() X-Git-Tag: v6.13-rc1~172^2~7 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=d4526a2d2d01e4dcb09c5535d3d4bb6ca763efeb;p=thirdparty%2Fkernel%2Flinux.git 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: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-22-b64f0842d512@linutronix.de --- diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c index b109cd7b5d01f..910d2082e05fd 100644 --- a/arch/powerpc/kernel/proc_powerpc.c +++ b/arch/powerpc/kernel/proc_powerpc.c @@ -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, - __pa(pde_data(file_inode(file))) >> PAGE_SHIFT, - PAGE_SIZE, vma->vm_page_prot); - return 0; + return remap_pfn_range(vma, vma->vm_start, + __pa(pde_data(file_inode(file))) >> PAGE_SHIFT, + PAGE_SIZE, vma->vm_page_prot); } static const struct proc_ops page_map_proc_ops = {