Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753962Ab2FSCSN (ORCPT ); Mon, 18 Jun 2012 22:18:13 -0400 Received: from mail-pb0-f46.google.com ([209.85.160.46]:50286 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752085Ab2FSCSJ (ORCPT ); Mon, 18 Jun 2012 22:18:09 -0400 From: Anton Vorontsov To: Greg Kroah-Hartman , Kees Cook , Colin Cross , Tony Luck Cc: Arnd Bergmann , John Stultz , Shuah Khan , arve@android.com, Rebecca Schultz Zavin , Jesper Juhl , Randy Dunlap , Stephen Boyd , Thomas Meyer , Andrew Morton , Marco Stornelli , WANG Cong , linux-kernel@vger.kernel.org, devel@driverdev.osuosl.org, linaro-kernel@lists.linaro.org, patches@linaro.org, kernel-team@android.com Subject: [PATCH 3/7] pstore/ram_core: Proper checking for post_init errors (e.g. improper ECC size) Date: Mon, 18 Jun 2012 19:15:52 -0700 Message-Id: <1340072156-6225-3-git-send-email-anton.vorontsov@linaro.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <20120619021050.GA19387@lizard> References: <20120619021050.GA19387@lizard> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1706 Lines: 61 We will implement variable-sized ECC buffers soon, so post_init routine might fail much more likely, so we'd better check for its errors. To make error handling simple, modify persistent_ram_free() to it be safe at all times. Signed-off-by: Anton Vorontsov --- fs/pstore/ram_core.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c index 2653185..f62ebf2 100644 --- a/fs/pstore/ram_core.c +++ b/fs/pstore/ram_core.c @@ -427,11 +427,17 @@ static int __devinit persistent_ram_post_init(struct persistent_ram_zone *prz, void persistent_ram_free(struct persistent_ram_zone *prz) { - if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { - vunmap(prz->vaddr); - } else { - iounmap(prz->vaddr); - release_mem_region(prz->paddr, prz->size); + if (!prz) + return; + + if (prz->vaddr) { + if (pfn_valid(prz->paddr >> PAGE_SHIFT)) { + vunmap(prz->vaddr); + } else { + iounmap(prz->vaddr); + release_mem_region(prz->paddr, prz->size); + } + prz->vaddr = NULL; } persistent_ram_free_old(prz); kfree(prz); @@ -454,10 +460,12 @@ struct persistent_ram_zone * __devinit persistent_ram_new(phys_addr_t start, if (ret) goto err; - persistent_ram_post_init(prz, ecc); + ret = persistent_ram_post_init(prz, ecc); + if (ret) + goto err; return prz; err: - kfree(prz); + persistent_ram_free(prz); return ERR_PTR(ret); } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/