From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A25121E86C; Mon, 1 Apr 2024 16:40:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711989601; cv=none; b=VtYUwvBwLdeRgf61zBULzDM/HsRsDgTw4onX0iJSx597TtYJIGofmR3s3Udb9hgIFK12XkNgal646i+5uyv/Jfh1hk6t87jiJEgGYRa7BSumho7Q7WIYJjkWzCSFnvzjPHQz49nJAoQuVWkZv2ZzYGwcgRmmTREM4lf+SgLHop8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711989601; c=relaxed/simple; bh=gHYTFgSjMCiKQ/RNt9Ru4OUmavjjayEdqEuk9gQrP8U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=puVxvz+FLLKmZQuMzqj+FDdRjh9CzT3LzWcr21weuwSEbHnYH+N53Jy+iDydyLhpBihsbG+HHrxOIDDtRSEHSX6VklL1hcUqapOwDWWdf8Y8RS0x+xisQcHZigUfiV+DaTlIdALLFSYW9+6XbVn22xHjv9zdYchSRfI1I7sqIIs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=lWzkDLTJ; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="lWzkDLTJ" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 10A00C433F1; Mon, 1 Apr 2024 16:40:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1711989601; bh=gHYTFgSjMCiKQ/RNt9Ru4OUmavjjayEdqEuk9gQrP8U=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lWzkDLTJQthKFX7wl9/76DQeA1Y4I2MP3ohQAl8qa0pvP9+Qm8iFHCHMEjufioyk7 rEGhtjuyOwoMhBPs8IWIzzSeqIpZohvcbnPCRXGXpH3tjGRL2A5Grxwe85oiq/t689 Ci5LfanMVoZkwHW/dlxBvzmd6cpYmQE/RXmCYayg= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tony Battersby , Greg Edwards , Jens Axboe , Sasha Levin Subject: [PATCH 6.6 098/396] block: Fix page refcounts for unaligned buffers in __bio_release_pages() Date: Mon, 1 Apr 2024 17:42:27 +0200 Message-ID: <20240401152550.844216763@linuxfoundation.org> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240401152547.867452742@linuxfoundation.org> References: <20240401152547.867452742@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tony Battersby [ Upstream commit 38b43539d64b2fa020b3b9a752a986769f87f7a6 ] Fix an incorrect number of pages being released for buffers that do not start at the beginning of a page. Fixes: 1b151e2435fc ("block: Remove special-casing of compound pages") Cc: stable@vger.kernel.org Signed-off-by: Tony Battersby Tested-by: Greg Edwards Link: https://lore.kernel.org/r/86e592a9-98d4-4cff-a646-0c0084328356@cybernetics.com Signed-off-by: Jens Axboe Signed-off-by: Sasha Levin --- block/bio.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/block/bio.c b/block/bio.c index 270f6b99926ea..62419aa09d731 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1149,7 +1149,7 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty) bio_for_each_folio_all(fi, bio) { struct page *page; - size_t done = 0; + size_t nr_pages; if (mark_dirty) { folio_lock(fi.folio); @@ -1157,10 +1157,11 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty) folio_unlock(fi.folio); } page = folio_page(fi.folio, fi.offset / PAGE_SIZE); + nr_pages = (fi.offset + fi.length - 1) / PAGE_SIZE - + fi.offset / PAGE_SIZE + 1; do { bio_release_page(bio, page++); - done += PAGE_SIZE; - } while (done < fi.length); + } while (--nr_pages != 0); } } EXPORT_SYMBOL_GPL(__bio_release_pages); -- 2.43.0