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> int i, ret = -ENOMEM; > > + /* > + * Size check. The "len" should be less than totalram since system_heap > + * memory is comes from system. Adding check here can prevent comsuming > + * too much time for invalid allocations. > + */ > + if (PFN_DOWN(len) > totalram_pages()) > + return ERR_PTR(-EINVAL); > + > buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); > if (!buffer) > return ERR_PTR(-ENOMEM); From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 0C452C433EF for ; Thu, 20 Jan 2022 10:22:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:Date:Message-ID:From: 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linaro-mm-sig@lists.linaro.org, lmark@codeaurora.org, wsd_upstream@mediatek.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, caoguangming34@gmail.com, michael.j.ruhl@intel.com, yf.wang@mediatek.com, libo.kang@mediatek.com, benjamin.gaignard@linaro.org, bo.song@mediatek.com, matthias.bgg@gmail.com, linux-mediatek@lists.infradead.org, labbott@redhat.com, mingyuan.ma@mediatek.com, jianjiao.zeng@mediatek.com, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Am 20.01.22 um 11:00 schrieb guangming.cao@mediatek.com: > From: Guangming > > Add a size check for allocation since the allocation size should be > always less than the total DRAM size on system heap. > Adding this check can prevent comsuming too much time for invalid allocations. > > Signed-off-by: Guangming > Acked-by: John Stultz Acked-by: Christian König > --- > drivers/dma-buf/heaps/system_heap.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/dma-buf/heaps/system_heap.c b/drivers/dma-buf/heaps/system_heap.c > index 23a7e74ef966..b65e597a742f 100644 > --- a/drivers/dma-buf/heaps/system_heap.c > +++ b/drivers/dma-buf/heaps/system_heap.c > @@ -347,6 +347,14 @@ static struct dma_buf *system_heap_allocate(struct dma_heap *heap, > struct page *page, *tmp_page; > int i, ret = -ENOMEM; > > + /* > + * Size check. The "len" should be less than totalram since system_heap > + * memory is comes from system. Adding check here can prevent comsuming > + * too much time for invalid allocations. > + */ > + if (PFN_DOWN(len) > totalram_pages()) > + return ERR_PTR(-EINVAL); > + > buffer = kzalloc(sizeof(*buffer), GFP_KERNEL); > if (!buffer) > return ERR_PTR(-ENOMEM); From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1C73FC433EF for ; Thu, 20 Jan 2022 10:23:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:In-Reply-To:Date:Message-ID:From: References:Cc:To:Subject:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; 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charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org QW0gMjAuMDEuMjIgdW0gMTE6MDAgc2NocmllYiBndWFuZ21pbmcuY2FvQG1lZGlhdGVrLmNvbToK PiBGcm9tOiBHdWFuZ21pbmcgPEd1YW5nbWluZy5DYW9AbWVkaWF0ZWsuY29tPgo+Cj4gQWRkIGEg c2l6ZSBjaGVjayBmb3IgYWxsb2NhdGlvbiBzaW5jZSB0aGUgYWxsb2NhdGlvbiBzaXplIHNob3Vs ZCBiZQo+IGFsd2F5cyBsZXNzIHRoYW4gdGhlIHRvdGFsIERSQU0gc2l6ZSBvbiBzeXN0ZW0gaGVh cC4KPiBBZGRpbmcgdGhpcyBjaGVjayBjYW4gcHJldmVudCBjb21zdW1pbmcgdG9vIG11Y2ggdGlt ZSBmb3IgaW52YWxpZCBhbGxvY2F0aW9ucy4KPgo+IFNpZ25lZC1vZmYtYnk6IEd1YW5nbWluZyA8 R3VhbmdtaW5nLkNhb0BtZWRpYXRlay5jb20+Cj4gQWNrZWQtYnk6IEpvaG4gU3R1bHR6IDxqb2hu LnN0dWx0ekBsaW5hcm8ub3JnPgoKQWNrZWQtYnk6IENocmlzdGlhbiBLw7ZuaWcgPGNocmlzdGlh bi5rb2VuaWdAYW1kLmNvbT4KCj4gLS0tCj4gICBkcml2ZXJzL2RtYS1idWYvaGVhcHMvc3lzdGVt X2hlYXAuYyB8IDggKysrKysrKysKPiAgIDEgZmlsZSBjaGFuZ2VkLCA4IGluc2VydGlvbnMoKykK Pgo+IGRpZmYgLS1naXQgYS9kcml2ZXJzL2RtYS1idWYvaGVhcHMvc3lzdGVtX2hlYXAuYyBiL2Ry aXZlcnMvZG1hLWJ1Zi9oZWFwcy9zeXN0ZW1faGVhcC5jCj4gaW5kZXggMjNhN2U3NGVmOTY2Li5i NjVlNTk3YTc0MmYgMTAwNjQ0Cj4gLS0tIGEvZHJpdmVycy9kbWEtYnVmL2hlYXBzL3N5c3RlbV9o ZWFwLmMKPiArKysgYi9kcml2ZXJzL2RtYS1idWYvaGVhcHMvc3lzdGVtX2hlYXAuYwo+IEBAIC0z NDcsNiArMzQ3LDE0IEBAIHN0YXRpYyBzdHJ1Y3QgZG1hX2J1ZiAqc3lzdGVtX2hlYXBfYWxsb2Nh dGUoc3RydWN0IGRtYV9oZWFwICpoZWFwLAo+ICAgCXN0cnVjdCBwYWdlICpwYWdlLCAqdG1wX3Bh Z2U7Cj4gICAJaW50IGksIHJldCA9IC1FTk9NRU07Cj4gICAKPiArCS8qCj4gKwkgKiBTaXplIGNo ZWNrLiBUaGUgImxlbiIgc2hvdWxkIGJlIGxlc3MgdGhhbiB0b3RhbHJhbSBzaW5jZSBzeXN0ZW1f aGVhcAo+ICsJICogbWVtb3J5IGlzIGNvbWVzIGZyb20gc3lzdGVtLiBBZGRpbmcgY2hlY2sgaGVy ZSBjYW4gcHJldmVudCBjb21zdW1pbmcKPiArCSAqIHRvbyBtdWNoIHRpbWUgZm9yIGludmFsaWQg YWxsb2NhdGlvbnMuCj4gKwkgKi8KPiArCWlmIChQRk5fRE9XTihsZW4pID4gdG90YWxyYW1fcGFn ZXMoKSkKPiArCQlyZXR1cm4gRVJSX1BUUigtRUlOVkFMKTsKPiArCj4gICAJYnVmZmVyID0ga3ph bGxvYyhzaXplb2YoKmJ1ZmZlciksIEdGUF9LRVJORUwpOwo+ICAgCWlmICghYnVmZmVyKQo+ICAg CQlyZXR1cm4gRVJSX1BUUigtRU5PTUVNKTsKCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1h cm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcv bWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg==