linux-kernel - [tip: timers/vdso] powerpc/procfs: Propagate error of remap_pfn

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Message-ID: <173054821528.3137.17045473266195256592.tip-bot2@tip-bot2>
Date: Sat, 02 Nov 2024 11:50:15 -0000
From:
 tip-bot2 for Thomas Weißschuh <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: thomas.weissschuh@...utronix.de, Thomas Gleixner <tglx@...utronix.de>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject:
 [tip: timers/vdso] powerpc/procfs: Propagate error of remap_pfn_range()

The following commit has been merged into the timers/vdso branch of tip:

Commit-ID:     d4526a2d2d01e4dcb09c5535d3d4bb6ca763efeb
Gitweb:        https://git.kernel.org/tip/d4526a2d2d01e4dcb09c5535d3d4bb6ca763efeb
Author:        Thomas Weißschuh <thomas.weissschuh@...utronix.de>
AuthorDate:    Thu, 10 Oct 2024 09:01:24 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 02 Nov 2024 12:37:35 +01:00

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

---
 arch/powerpc/kernel/proc_powerpc.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/proc_powerpc.c b/arch/powerpc/kernel/proc_powerpc.c
index b109cd7..910d208 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 = {