From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20120124023924.022692391@clark.kroah.org> Date: Mon, 23 Jan 2012 18:33:41 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Roman Tereshonkov , Artem Bityutskiy , David Woodhouse Subject: [001/129] mtdoops: fix the oops_page_used array size In-Reply-To: <20120124024041.GA18422@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ Content-Length: 1181 Lines: 33 From: Roman Tereshonkov commit 556f063580db2953a7e53cd46b47724246320f60 upstream. The array of unsigned long pointed by oops_page_used is allocated by vmalloc which requires the size to be in bytes. BITS_PER_LONG is equal to 32. If we want to allocate memory for 32 pages with one bit per page then 32 / BITS_PER_LONG is equal to 1 byte that is 8 bits. To fix it we need to multiply the result by sizeof(unsigned long) equal to 4. Signed-off-by: Roman Tereshonkov Signed-off-by: Artem Bityutskiy Signed-off-by: David Woodhouse Signed-off-by: Greg Kroah-Hartman --- drivers/mtd/mtdoops.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/mtd/mtdoops.c +++ b/drivers/mtd/mtdoops.c @@ -369,7 +369,7 @@ static void mtdoops_notify_add(struct mt /* oops_page_used is a bit field */ cxt->oops_page_used = vmalloc(DIV_ROUND_UP(mtdoops_pages, - BITS_PER_LONG)); + BITS_PER_LONG) * sizeof(unsigned long)); if (!cxt->oops_page_used) { printk(KERN_ERR "mtdoops: could not allocate page array\n"); return;