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([106.84.129.156]) by smtp.gmail.com with ESMTPSA id g8-20020a1709029f8800b001a80ad9c599sm1422857plq.294.2023.07.27.04.58.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 27 Jul 2023 04:58:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20221208; t=1690459133; x=1691063933; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=iJy56iIC6ntBFdpPInsAvAbRshuAe050haSS25yPZEY=; b=K0IkK2QAAtZ7KRsQmg1++8LpQmW4QJ0bk5LEbv4HmVqDqtuFwMlxdKN2doQjvhdKvw sgcqONYHszxF+s2io0TFcCJ3MKXlI2JyEVOt5iitP6oGXTSNfJiZrVztXYHXNLyxR3rJ pwDn2Y4vLBpHCCXUHnrUWMDylvyNLNVCf/DaV9cJW4sZLEOx3G2NUMhkC6zATm6Wiy6U vkXVy8iZEHtnIoCupEPeqypJnyFZc4CHrraQcH2jgtgq30kl70Gu/oSbIVZ1n8tb4qq3 rgd23kotGXGp/n/Qrv9VzaX/0UHZU2vOq0WxP6zdo5w9hue5K7Q3v8i+0kHdLIs/7yoh dpoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690459133; x=1691063933; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=iJy56iIC6ntBFdpPInsAvAbRshuAe050haSS25yPZEY=; b=gRpk+CElBQ2vNdhRphiz99vWAwhgDb2l8TRPecMbJ2W/JBBqwdu3V/0kWb8SSOAWjv xJlB0nmyffDEsoib/33MUiyY0T7v2EAhCfycF3/wUyghTJmX3+vXrpzUxVXSZdOwE6x9 yfAf3mF/+aTVB8r2muXAdAC8VDvbr8ej1qo/KNTBRlHH3/317efZ9g0WFlTHyanMYret 2zq5GAWJt5c1lM/M2gZfc73hkCT3fy45GbU1fVHE+aSanKTzmdvh13Ub9vLnOVDAOlxe wWojcGFxAVj3T/oyAWYthNERx3LAfSnwrQ4R//2Pt3h5+UXvUQPxfCijCW6QIhzMkSf4 jyhw== X-Gm-Message-State: ABy/qLaAV3SYURkZbUeQHKHqbqYYqA2Pskp8trrda4NW758748j0TXww HI2HjsvR+K7e3msYO/Ov65BHIAo0fXt3NnwM7gI= X-Google-Smtp-Source: APBJJlHmlPJLvqdHJDPJq5ZqVXsUQ+FV8N8WvvUnq1ZbgyMAdsIQiW519qHWbWcM9xX19jyZoK2fRQ== X-Received: by 2002:a17:902:bcc9:b0:1b1:7362:9a18 with SMTP id o9-20020a170902bcc900b001b173629a18mr3668706pls.27.1690459132652; Thu, 27 Jul 2023 04:58:52 -0700 (PDT) From: Sam Li To: qemu-devel@nongnu.org Cc: hare@suse.de, stefanha@redhat.com, mjrosato@linux.ibm.com, qemu-block@nongnu.org, Hanna Reitz , dmitry.fomichev@wdc.com, Kevin Wolf , dlemoal@kernel.org, Sam Li Subject: [PATCH v2] block/file-posix: fix g_file_get_contents return path Date: Thu, 27 Jul 2023 19:58:44 +0800 Message-Id: <20230727115844.8480-1-faithilikerun@gmail.com> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62e; envelope-from=faithilikerun@gmail.com; helo=mail-pl1-x62e.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1690459829637100007 Content-Type: text/plain; charset="utf-8" The g_file_get_contents() function returns a g_boolean. If it fails, the returned value will be 0 instead of -1. Solve the issue by skipping assigning ret value. This issue was found by Matthew Rosato using virtio-blk-{pci,ccw} backed by an NVMe partition e.g. /dev/nvme0n1p1 on s390x. Signed-off-by: Sam Li Reviewed-by: Matthew Rosato Reviewed-by: Stefan Hajnoczi Reviewed-by: Daniel P. Berrang=C3=A9 --- block/file-posix.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/block/file-posix.c b/block/file-posix.c index 9e8e3d8ca5..b16e9c21a1 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -1232,7 +1232,6 @@ static int hdev_get_max_hw_transfer(int fd, struct st= at *st) static int get_sysfs_str_val(struct stat *st, const char *attribute, char **val) { g_autofree char *sysfspath =3D NULL; - int ret; size_t len; =20 if (!S_ISBLK(st->st_mode)) { @@ -1242,8 +1241,7 @@ static int get_sysfs_str_val(struct stat *st, const c= har *attribute, sysfspath =3D g_strdup_printf("/sys/dev/block/%u:%u/queue/%s", major(st->st_rdev), minor(st->st_rdev), attribute); - ret =3D g_file_get_contents(sysfspath, val, &len, NULL); - if (ret =3D=3D -1) { + if (!g_file_get_contents(sysfspath, val, &len, NULL)) { return -ENOENT; } =20 @@ -1253,7 +1251,7 @@ static int get_sysfs_str_val(struct stat *st, const c= har *attribute, if (*(p + len - 1) =3D=3D '\n') { *(p + len - 1) =3D '\0'; } - return ret; + return 0; } #endif =20 --=20 2.40.1