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Fri, 21 May 2021 20:34:34 +0800 Subject: Re: [PATCH] dma-iommu: Add a check to avoid dereference null pointer in function iommu_dma_map_sg() To: Robin Murphy , , , References: <1621566334-93468-1-git-send-email-chenxiang66@hisilicon.com> <56f7f4fa-8d62-cc6e-cb1c-adbf82e34d31@arm.com> From: "chenxiang (M)" Message-ID: <8a323d71-006f-fe3c-4ecc-a69d85a6409a@hisilicon.com> Date: Fri, 21 May 2021 20:34:33 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0 MIME-Version: 1.0 In-Reply-To: <56f7f4fa-8d62-cc6e-cb1c-adbf82e34d31@arm.com> X-Originating-IP: [10.40.193.166] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggeme756-chm.china.huawei.com (10.3.19.102) X-CFilter-Loop: Reflected Cc: iommu@lists.linux-foundation.org, linuxarm@openeuler.org, linuxarm@huawei.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" CgrlnKggMjAyMS81LzIxIDE4OjM2LCBSb2JpbiBNdXJwaHkg5YaZ6YGTOgo+IE9uIDIwMjEtMDUt MjEgMDQ6MDUsIGNoZW54aWFuZyB3cm90ZToKPj4gRnJvbTogWGlhbmcgQ2hlbiA8Y2hlbnhpYW5n NjZAaGlzaWxpY29uLmNvbT4KPj4KPj4gVGhlIGlzc3VlIGlzIHJlcG9ydGVkIGJ5IHRvb2wgVHNj YW5Db2RlLCBhbmQgaXQgaXMgcG9zc2libGUgdG8gZGVmZXJlbmNlCj4+IG51bGwgcG9pbnRlciB3 aGVuIHByZXYgaXMgTlVMTCB3aGljaCBpcyB0aGUgaW5pdGlhbCB2YWx1ZS4KPgo+IE5vIGl0IGlz bid0LiBUaGlzIGlzIGxpdGVyYWxseSBleHBsYWluZWQgaW4gdGhlIGNvbW1lbnQgdmlzaWJsZSBp biB0aGUgCj4gZGlmZiBjb250ZXh0IGJlbG93Li4uCj4KPiBSb2Jpbi4KCm9rLCB0aGFua3MKCj4K Pj4gU2lnbmVkLW9mZi1ieTogWGlhbmcgQ2hlbiA8Y2hlbnhpYW5nNjZAaGlzaWxpY29uLmNvbT4K Pj4gLS0tCj4+ICAgZHJpdmVycy9pb21tdS9kbWEtaW9tbXUuYyB8IDIgKy0KPj4gICAxIGZpbGUg Y2hhbmdlZCwgMSBpbnNlcnRpb24oKyksIDEgZGVsZXRpb24oLSkKPj4KPj4gZGlmZiAtLWdpdCBh L2RyaXZlcnMvaW9tbXUvZG1hLWlvbW11LmMgYi9kcml2ZXJzL2lvbW11L2RtYS1pb21tdS5jCj4+ IGluZGV4IDRjYjYzYjIuLjg4YTRmMzQgMTAwNjQ0Cj4+IC0tLSBhL2RyaXZlcnMvaW9tbXUvZG1h LWlvbW11LmMKPj4gKysrIGIvZHJpdmVycy9pb21tdS9kbWEtaW9tbXUuYwo+PiBAQCAtMTA0Miw3 ICsxMDQyLDcgQEAgc3RhdGljIGludCBpb21tdV9kbWFfbWFwX3NnKHN0cnVjdCBkZXZpY2UgKmRl diwgCj4+IHN0cnVjdCBzY2F0dGVybGlzdCAqc2csCj4+ICAgICAgICAgICAgKiAgIGlvdmFfbGVu ID09IDAsIHRodXMgd2UgY2Fubm90IGRlcmVmZXJlbmNlIHByZXYgdGhlIGZpcnN0Cj4+ICAgICAg ICAgICAgKiAgIHRpbWUgdGhyb3VnaCBoZXJlIChpLmUuIGJlZm9yZSBpdCBoYXMgYSBtZWFuaW5n ZnVsIAo+PiB2YWx1ZSkuCj4+ICAgICAgICAgICAgKi8KPj4gLSAgICAgICAgaWYgKHBhZF9sZW4g JiYgcGFkX2xlbiA8IHNfbGVuZ3RoIC0gMSkgewo+PiArICAgICAgICBpZiAocHJldiAmJiBwYWRf bGVuICYmIHBhZF9sZW4gPCBzX2xlbmd0aCAtIDEpIHsKPj4gICAgICAgICAgICAgICBwcmV2LT5s ZW5ndGggKz0gcGFkX2xlbjsKPj4gICAgICAgICAgICAgICBpb3ZhX2xlbiArPSBwYWRfbGVuOwo+ PiAgICAgICAgICAgfQo+Pgo+Cj4gLgo+CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX18KaW9tbXUgbWFpbGluZyBsaXN0CmlvbW11QGxpc3RzLmxpbnV4LWZv dW5kYXRpb24ub3JnCmh0dHBzOi8vbGlzdHMubGludXhmb3VuZGF0aW9uLm9yZy9tYWlsbWFuL2xp c3RpbmZvL2lvbW11