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powerpc/procfs: Propagate error of remap_pfn_range()

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

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20241010-vdso-generic-base-v1-22-b64f0842d512@linutronix.de
This commit is contained in:
Thomas Weißschuh
2024-10-10 09:01:24 +02:00
committed by Thomas Gleixner
parent e449c83ac5
commit d4526a2d2d
1 changed files with 3 additions and 4 deletions
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7
arch/powerpc/kernel/proc_powerpc.c
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@@ -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 = {