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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 Subject: Re: [PATCH] misc: fastrpc: Fix double free of 'buf' in error path Content-Language: en-US To: Dan Carpenter Cc: Sukrut Bellary , Abel Vesa , Amol Maheshwari , Arnd Bergmann , Greg Kroah-Hartman , linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org, Shuah Khan References: <20230518100829.515143-1-sukrut.bellary@linux.com> <9194ebdf-f335-4cd6-bf89-bb4f86a57784@kili.mountain> From: Srinivas Kandagatla In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org On 19/05/2023 11:22, Dan Carpenter wrote: >> ----------------------->cut<--------------------------- >> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c >> index f60bbf99485c..3fdd326e1ae8 100644 >> --- a/drivers/misc/fastrpc.c >> +++ b/drivers/misc/fastrpc.c >> @@ -1891,7 +1891,8 @@ static int fastrpc_req_mmap(struct fastrpc_user *fl, >> char __user *argp) >> &args[0]); >> if (err) { >> dev_err(dev, "mmap error (len 0x%08llx)\n", buf->size); >> - goto err_invoke; >> + fastrpc_buf_free(buf); >> + return err; >> } >> >> /* update the buffer to be able to deallocate the memory on the DSP >> */ >> @@ -1930,11 +1931,7 @@ static int fastrpc_req_mmap(struct fastrpc_user *fl, >> char __user *argp) >> return 0; >> >> err_assign: >> - fastrpc_req_munmap_impl(fl, buf); >> -err_invoke: >> - fastrpc_buf_free(buf); >> - >> - return err; >> + return fastrpc_req_munmap_impl(fl, buf); > > This will return success if copy_to_user() fails. > that is true, using return value of fastrpc_req_munmap_impl does not really make sense here we should just return err in either case to the user. --srini > regards, > dan carpenter >