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Mon, 22 Dec 2025 20:41:33 +0800 (CST) Date: Mon, 22 Dec 2025 20:41:33 +0800 (CST) From: yangshiguang To: "Greg KH" Cc: rafael@kernel.org, dakr@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org, yangshiguang@xiaomi.com, stable@vger.kernel.org Subject: Re:Re: [PATCH] debugfs: Fix NULL pointer dereference at debugfs_read_file_str X-Priority: 3 X-Mailer: Coremail Webmail Server Version 2023.4-cmXT build 20250723(a044bf12) Copyright (c) 2002-2025 www.mailtech.cn 163com In-Reply-To: <2025122234-crazy-remix-3098@gregkh> References: <20251222093615.663252-2-yangshiguang1011@163.com> <2025122234-crazy-remix-3098@gregkh> X-NTES-SC: AL_Qu2dBPibuEoi5SWYZukfmUgRj+k6WsK3s/sn3oNfP5B+jCnr8xo9UV1mEXzp+c2RCya0rj2OXT10yO9le4tlVowgFlVYlYGQlvbMoDKqiEIUpw== Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <17647e4c.d461.19b46144a4e.Coremail.yangshiguang1011@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID:iCgvCgBXnut9PElp9kNGAA--.29116W X-CM-SenderInfo: 51dqw25klj3ttqjriiqr6rljoofrz/xtbC+h3awGlJPH1WHwAA3V X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== CkF0IDIwMjUtMTItMjIgMTk6NTQ6MjIsICJHcmVnIEtIIiA8Z3JlZ2toQGxpbnV4Zm91bmRhdGlv bi5vcmc+IHdyb3RlOgo+T24gTW9uLCBEZWMgMjIsIDIwMjUgYXQgMDU6MzY6MTZQTSArMDgwMCwg eWFuZ3NoaWd1YW5nMTAxMUAxNjMuY29tIHdyb3RlOgo+PiBGcm9tOiB5YW5nc2hpZ3VhbmcgPHlh bmdzaGlndWFuZ0B4aWFvbWkuY29tPgo+PiAKPj4gQ2hlY2sgaW4gZGVidWdmc19yZWFkX2ZpbGVf c3RyKCkgaWYgdGhlIHN0cmluZyBwb2ludGVyIGlzIE5VTEwuCj4+IAo+PiBXaGVuIGNyZWF0aW5n IGEgbm9kZSB1c2luZyBkZWJ1Z2ZzX2NyZWF0ZV9zdHIoKSwgdGhlIHN0cmluZyBwYXJhbWV0ZXIK Pj4gdmFsdWUgY2FuIGJlIE5VTEwgdG8gaW5kaWNhdGUgZW1wdHkvdW51c2VkL2lnbm9yZWQuCj4K PldoeSB3b3VsZCB5b3UgY3JlYXRlIGFuIGVtcHR5IGRlYnVnZnMgc3RyaW5nIGZpbGU/ICBUaGF0 IGlzIG5vdCBvaywgd2UKPnNob3VsZCBjaGFuZ2UgdGhhdCB0byBub3QgYWxsb3cgdGhpcy4KCkhp IGdyZWcgay1oLAoKVGhhbmtzIGZvciB5b3VyIHJlcGx5LgoKVGhpcyBpcyBkdWUgdG8gdGhlIHVz YWdlIHN0ZXAsIHNob3VsZCB3cml0ZSBmaXJzdCBhbmQgdGhlbiByZWFkLgpIb3dldmVyLCB0aGVy ZSBpcyBubyB3YXkgdG8gZ3VhcmFudGVlIHRoYXQgZXZlcnlvbmUgd2lsbCBrbm93IGFib3V0IHRo aXMgc3RlcC4KCkFuZCBkZWJ1Z2ZzX2NyZWF0ZV9zdHIoKSBhbGxvd3MgcGFzc2luZyBpbiBhIE5V TEwgc3RyaW5nLiAKVGhlcmVmb3JlLCB3aGVuIHJlYWRpbmcgYSBOVUxMIHN0cmluZywgc2hvdWxk IHJldHVybiBhbiBpbnZhbGlkIGVycm9yIAppbnN0ZWFkIG9mIHBhbmljLgoKPgo+PiBIb3dldmVy LCByZWFkaW5nIHRoaXMgbm9kZSB1c2luZyBkZWJ1Z2ZzX3JlYWRfZmlsZV9zdHIoKSB3aWxsIGNh dXNlIGEKPj4ga2VybmVsIHBhbmljLgo+PiBUaGlzIHNob3VsZCBub3QgYmUgZmF0YWwsIHNvIHJl dHVybiBhbiBpbnZhbGlkIGVycm9yLgo+PiAKPj4gU2lnbmVkLW9mZi1ieTogeWFuZ3NoaWd1YW5n IDx5YW5nc2hpZ3VhbmdAeGlhb21pLmNvbT4KPj4gRml4ZXM6IDlhZjA0NDBlYzg2ZSAoImRlYnVn ZnM6IEltcGxlbWVudCBkZWJ1Z2ZzX2NyZWF0ZV9zdHIoKSIpCj4+IENjOiBzdGFibGVAdmdlci5r ZXJuZWwub3JnCj4+IC0tLQo+PiAgZnMvZGVidWdmcy9maWxlLmMgfCAzICsrKwo+PiAgMSBmaWxl IGNoYW5nZWQsIDMgaW5zZXJ0aW9ucygrKQo+PiAKPj4gZGlmZiAtLWdpdCBhL2ZzL2RlYnVnZnMv ZmlsZS5jIGIvZnMvZGVidWdmcy9maWxlLmMKPj4gaW5kZXggM2VjMzMyNGMyMDYwLi5hMjJmZjBj ZWIyMzAgMTAwNjQ0Cj4+IC0tLSBhL2ZzL2RlYnVnZnMvZmlsZS5jCj4+ICsrKyBiL2ZzL2RlYnVn ZnMvZmlsZS5jCj4+IEBAIC0xMDI2LDYgKzEwMjYsOSBAQCBzc2l6ZV90IGRlYnVnZnNfcmVhZF9m aWxlX3N0cihzdHJ1Y3QgZmlsZSAqZmlsZSwgY2hhciBfX3VzZXIgKnVzZXJfYnVmLAo+PiAgCQly ZXR1cm4gcmV0Owo+PiAgCj4+ICAJc3RyID0gKihjaGFyICoqKWZpbGUtPnByaXZhdGVfZGF0YTsK Pj4gKwlpZiAoIXN0cikKPj4gKwkJcmV0dXJuIC1FSU5WQUw7Cj4KPldoYXQgaW4ga2VybmVsIHVz ZXIgY2F1c2VzIHRoaXMgdG8gaGFwcGVuPyAgTGV0J3MgZml4IHRoYXQgdXAgaW5zdGVhZAo+cGxl YXNlLgo+CgpDdXJyZW50bHkgSSBrbm93biBwcm9ibGVtYXRpYyBub2RlcyBpbiB0aGUga2VybmVs OgoKZHJpdmVycy9pbnRlcmNvbm5lY3QvZGVidWdmcy1jbGllbnQuYzoKICAxNTU6IAlkZWJ1Z2Zz X2NyZWF0ZV9zdHIoInNyY19ub2RlIiwgMDYwMCwgY2xpZW50X2RpciwgJnNyY19ub2RlKTsKICAx NTY6IAlkZWJ1Z2ZzX2NyZWF0ZV9zdHIoImRzdF9ub2RlIiwgMDYwMCwgY2xpZW50X2RpciwgJmRz dF9ub2RlKTsKZHJpdmVycy9zb3VuZHdpcmUvZGVidWdmcy5jOgogIDM2MjogCWRlYnVnZnNfY3Jl YXRlX3N0cigiZmlybXdhcmVfZmlsZSIsIDAyMDAsIGQsICZmaXJtd2FyZV9maWxlKTsKCnRlc3Qg Y2FzZToKMS4gY3JlYXRlIGEgTlVMTCBzdHJpbmcgbm9kZQpjaGFyICp0ZXN0X25vZGUgPSBOVUxM OwpkZWJ1Z2ZzX2NyZWF0ZV9zdHIoInRlc3Rfbm9kZSIsIDA2MDAsIHBhcmVudF9kaXIsICZ0ZXN0 X25vZGUpOwoKMi4gcmVhZCB0aGUgbm9kZSwgbGlrZSBiZWxsb3c6CmNhdCAvc3lzL2tlcm5lbC9k ZWJ1Zy90ZXN0X25vZGUKCj50aGFua3MsCj4KPmdyZWcgay1oCg==