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[24.205.208.113]) by smtp.gmail.com with ESMTPSA id ny8-20020a056870be0800b000f303e9538csm1834556oab.30.2022.05.29.05.52.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 29 May 2022 05:52:35 -0700 (PDT) Subject: Re: [PATCH] cifs: set length when cifs_copy_pages_to_iter is successful To: Steve French , Nick Desaulniers Cc: Steve French , Nathan Chancellor , David Howells , CIFS , samba-technical , LKML , llvm@lists.linux.dev, Steve French References: <20220526140226.2648689-1-trix@redhat.com> From: Tom Rix Message-ID: <3144155d-47c7-ccfd-ff52-e3fa4e0468ee@redhat.com> Date: Sun, 29 May 2022 05:52:33 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/28/22 4:31 PM, Steve French wrote: > Presumably this was in Dave Howell's patch set which we took out of > for-next to restructure in some of Al's feedback and some things found > during testing. So nothing to fix in current mainline or for-next ... > right? Yup. Nothing to fix. So drop this patch. Tom > > On Sat, May 28, 2022 at 3:40 PM Nick Desaulniers > wrote: >> + Steve's @microsoft.com email addr. >> >> On Thu, May 26, 2022 at 7:02 AM Tom Rix wrote: >>> clang build fails with >>> fs/cifs/smb2ops.c:4984:7: error: variable 'length' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized] >>> if (rdata->result != 0) { >>> ^~~~~~~~~~~~~~~~~~ >>> >>> handle_read_data() returns the number of bytes handled by setting the length variable. >>> This only happens in the copy_to_iter() branch, it needs to also happen in the >>> cifs_copy_pages_to_iter() branch. When cifs_copy_pages_to_iter() is successful, >>> its parameter data_len is how many bytes were handled, so set length to data_len. >>> >>> Fixes: 67fd8cff2b0f ("cifs: Change the I/O paths to use an iterator rather than a page list") >>> Signed-off-by: Tom Rix >>> --- >>> fs/cifs/smb2ops.c | 2 +- >>> 1 file changed, 1 insertion(+), 1 deletion(-) >>> >>> diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c >>> index 3630e132781f..bfad482ec186 100644 >>> --- a/fs/cifs/smb2ops.c >>> +++ b/fs/cifs/smb2ops.c >>> @@ -4988,7 +4988,7 @@ handle_read_data(struct TCP_Server_Info *server, struct mid_q_entry *mid, >>> dequeue_mid(mid, rdata->result); >>> return 0; >>> } >>> - rdata->got_bytes = pages_len; >>> + length = rdata->got_bytes = pages_len; >>> >>> } else if (buf_len >= data_offset + data_len) { >>> /* read response payload is in buf */ >>> -- >>> 2.27.0 >>> >> >> -- >> Thanks, >> ~Nick Desaulniers > >