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b=dr8wSvAVbxP/ZcIFTBwPH9dzXvhuBn9mA9nVh+Xgz7CJcVvdC39CZkNme4AyXP6YJ FWGyi7uuOUICVXiiTT/mIG9BdyZemGP4/ngMXLnrprJvuOVJflcC9gK/hPD0oGCWag aT5p1c3BKTvIpwJq4lWpELTuhZe/zgt3mUlYbqxRoekrxsz67uxzSSFqG5FXwM9E/o G1ugeyanFn0rXRDRijLJnbwzKap1acFDZxxJu4ignABfVoZxvW4pCLBHKwBhqj5cvl DjsJARsAA6SkUoD00o6dTzmSQNCeteiSTEpImZSPqwk0YU1IwQ0d1qUYo0SM+byxVD zCyAfk3cQXcsg== From: Christian Brauner To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever , stable@vger.kernel.org Subject: [PATCH v2 38/51] powerpc/crash_dump: check ioremap_cache() in copy_oldmem_page() Date: Wed, 4 Nov 2026 18:47:24 +0100 Message-ID: <20261104-work-procfs-bugfixes-v2-38-bbf7d5546809@kernel.org> In-Reply-To: <20261104-work-procfs-bugfixes-v2-0-bbf7d5546809@kernel.org> References: <20261104-work-procfs-bugfixes-v2-0-bbf7d5546809@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; 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If it didn't, the copy reads from an offset into the NULL page. That oopses unless the copy happens to be a user copy, whose exception table entries turn the fault into a short copy. Return -ENOMEM like the other architectures do. read_from_oldmem() turns that into -EFAULT like any other short copy. Reported-by: Chris Mason Fixes: 54c32021eb6f ("[PATCH] powerpc: Add arch-dependent copy_oldmem_page") Cc: stable@vger.kernel.org Signed-off-by: Christian Brauner (Amutable) --- arch/powerpc/kernel/crash_dump.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/kernel/crash_dump.c b/arch/powerpc/kernel/crash_dump.c index 103b6605dd68..1543917bd3e1 100644 --- a/arch/powerpc/kernel/crash_dump.c +++ b/arch/powerpc/kernel/crash_dump.c @@ -86,6 +86,8 @@ ssize_t copy_oldmem_page(struct iov_iter *iter, unsigned long pfn, csize = copy_to_iter(vaddr + offset, csize, iter); } else { vaddr = ioremap_cache(paddr, PAGE_SIZE); + if (!vaddr) + return -ENOMEM; csize = copy_to_iter(vaddr + offset, csize, iter); iounmap(vaddr); } -- 2.53.0