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Mon, 12 Jul 2021 14:55:39 -0700 (PDT) Received: from localhost.localdomain ([71.212.149.176]) by smtp.gmail.com with ESMTPSA id d2sm376932pjo.50.2021.07.12.14.55.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 12 Jul 2021 14:55:38 -0700 (PDT) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH 03/11] util/selfmap: Discard mapping on error Date: Mon, 12 Jul 2021 14:55:27 -0700 Message-Id: <20210712215535.1471256-4-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210712215535.1471256-1-richard.henderson@linaro.org> References: <20210712215535.1471256-1-richard.henderson@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::102a; envelope-from=richard.henderson@linaro.org; helo=mail-pj1-x102a.google.com X-Spam_score_int: -1 X-Spam_score: -0.2 X-Spam_bar: / X-Spam_report: (-0.2 / 5.0 requ) DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" >From clang-13: util/selfmap.c:26:21: error: variable 'errors' set but not used \ [-Werror,-Wunused-but-set-variable] Quite right of course, but there's no reason not to check errors. First, incrementing errors is incorrect, because qemu_strtoul returns an errno not a count -- just or them together so that we have a non-zero value at the end. Second, if we have an error, do not add the struct to the list, but free it instead. Cc: Alex Bennée Signed-off-by: Richard Henderson --- util/selfmap.c | 28 ++++++++++++++++------------ 1 file changed, 16 insertions(+), 12 deletions(-) diff --git a/util/selfmap.c b/util/selfmap.c index 2ec99dfdda..0178c2ff8b 100644 --- a/util/selfmap.c +++ b/util/selfmap.c @@ -23,29 +23,33 @@ GSList *read_self_maps(void) gchar **fields = g_strsplit(lines[i], " ", 6); if (g_strv_length(fields) > 4) { MapInfo *e = g_new0(MapInfo, 1); - int errors; + int errors = 0; const char *end; - errors = qemu_strtoul(fields[0], &end, 16, &e->start); - errors += qemu_strtoul(end + 1, NULL, 16, &e->end); + errors |= qemu_strtoul(fields[0], &end, 16, &e->start); + errors |= qemu_strtoul(end + 1, NULL, 16, &e->end); e->is_read = fields[1][0] == 'r'; e->is_write = fields[1][1] == 'w'; e->is_exec = fields[1][2] == 'x'; e->is_priv = fields[1][3] == 'p'; - errors += qemu_strtoul(fields[2], NULL, 16, &e->offset); + errors |= qemu_strtoul(fields[2], NULL, 16, &e->offset); e->dev = g_strdup(fields[3]); - errors += qemu_strtou64(fields[4], NULL, 10, &e->inode); + errors |= qemu_strtou64(fields[4], NULL, 10, &e->inode); - /* - * The last field may have leading spaces which we - * need to strip. - */ - if (g_strv_length(fields) == 6) { - e->path = g_strdup(g_strchug(fields[5])); + if (!errors) { + /* + * The last field may have leading spaces which we + * need to strip. + */ + if (g_strv_length(fields) == 6) { + e->path = g_strdup(g_strchug(fields[5])); + } + map_info = g_slist_prepend(map_info, e); + } else { + g_free(e); } - map_info = g_slist_prepend(map_info, e); } g_strfreev(fields); -- 2.25.1