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[34.168.92.83]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-714342e0a10sm10594254b3a.108.2024.08.28.15.19.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Aug 2024 15:19:21 -0700 (PDT) Date: Wed, 28 Aug 2024 22:19:18 +0000 From: Sami Tolvanen To: Petr Pavlu Cc: Masahiro Yamada , Luis Chamberlain , Miguel Ojeda , Greg Kroah-Hartman , Matthew Maurer , Alex Gaynor , Wedson Almeida Filho , Gary Guo , Neal Gompa , Hector Martin , Janne Grunau , Asahi Linux , linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-modules@vger.kernel.org, rust-for-linux@vger.kernel.org Subject: Re: [PATCH v2 05/19] gendwarfksyms: Expand base_type Message-ID: <20240828221918.GF2130480@google.com> References: <20240815173903.4172139-21-samitolvanen@google.com> <20240815173903.4172139-26-samitolvanen@google.com> <742f7226-9c66-4cfb-ba31-222dfb54fc34@suse.com> Precedence: bulk X-Mailing-List: linux-modules@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <742f7226-9c66-4cfb-ba31-222dfb54fc34@suse.com> On Wed, Aug 28, 2024 at 02:46:03PM +0200, Petr Pavlu wrote: > > +static int process_fmt(struct state *state, const char *fmt, ...) > > Nit: The state parameter is unused by a number of these process_*() > functions, including the leaf process(). I suggest removing it so it > doesn't need to be passed around unnecessarily. Good point, I'll clean this up. > > + char buf[MAX_FMT_BUFFER_SIZE]; > > + va_list args; > > + int res; > > + > > + va_start(args, fmt); > > + > > + res = checkp(vsnprintf(buf, sizeof(buf), fmt, args)); > > + if (res >= MAX_FMT_BUFFER_SIZE - 1) { > > This check looks off by one, though on the safe side: > res >= sizeof(buf) True, I'll fix this too. > > + if (dwarf_tag(&scopes[i]) == DW_TAG_compile_unit) > > + continue; > > + > > + name = get_name(&scopes[i]); > > + name = name ?: ""; > > + check(process(state, name)); > > + if (i > 0) > > + check(process(state, "::")); > > Failed check(process()) calls here return immediately and so would leak > scopes. However, I see this is fixed in the following patch > "gendwarfksyms: Add a cache for processed DIEs" so it's ok. Yeah, I noticed this as well. I think Masahiro's suggestion to just exit immediately on errors cleans up this situation a bit. Sami