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Wed, 15 Apr 2020 07:49:30 +0000 (UTC) Received: by blackfin.pond.sub.org (Postfix, from userid 1000) id CB6671132C38; Wed, 15 Apr 2020 09:49:27 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1586936973; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=ZTXu9VOC5cjy/LHpJSbxX3yw8P34uUaNspmSlmDPxBQ=; b=RGLB6+Oz6TiDzDGqR1ayYMTih0aOGI/41U6Lrn2iFIlTbIo7lDOXTMR2uhrKVBl53qke6S 4nrF0TjZBmwd8nM934IRbzgKA/mLn2Dj+7wwpZ81VUYWOjCQbQm2R8MUZD9KmxAVOq3W44 Aks2TG+bMJnD5z8v92tH2cSoJ1+VOhU= X-MC-Unique: njc0c8RrP3GEx9EmSsVteg-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PATCH v2 for-5.1 9/9] qemu-img: Reject broken -o "" Date: Wed, 15 Apr 2020 09:49:27 +0200 Message-Id: <20200415074927.19897-10-armbru@redhat.com> In-Reply-To: <20200415074927.19897-1-armbru@redhat.com> References: <20200415074927.19897-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 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: kwolf@redhat.com, qemu-block@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" qemu-img create, convert, amend, and measure use accumulate_options() to merge multiple -o options. This is broken for -o "": $ qemu-img create -f qcow2 -o backing_file=3Da -o "" -o backing_fmt=3Dr= aw,size=3D1M new.qcow2 qemu-img: warning: Could not verify backing image. This may become an e= rror in future versions. Could not open 'a,backing_fmt=3Draw': No such file or directory Formatting 'new.qcow2', fmt=3Dqcow2 size=3D1048576 backing_file=3Da,,ba= cking_fmt=3Draw cluster_size=3D65536 lazy_refcounts=3Doff refcount_bits=3D16 $ qemu-img info new.qcow2 image: new.qcow2 file format: qcow2 virtual size: 1 MiB (1048576 bytes) disk size: 196 KiB cluster_size: 65536 --> backing file: a,backing_fmt=3Draw Format specific information: compat: 1.1 lazy refcounts: false refcount bits: 16 corrupt: false Merging these three -o the obvious way is wrong, because it results in an unwanted ',' escape: backing_file=3Da,,backing_fmt=3Draw,size=3D1M ~~ We could silently drop -o "", but Kevin asked me to reject it instead. Signed-off-by: Markus Armbruster Reviewed-by: Eric Blake --- qemu-img.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/qemu-img.c b/qemu-img.c index cc51db7ed4..a2369766f0 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -229,14 +229,16 @@ static bool qemu_img_object_print_help(const char *ty= pe, QemuOpts *opts) * To make that work, @optarg must not start with ',' (or else a * separating ',' preceding it gets escaped), and it must not end with * an odd number of ',' (or else a separating ',' following it gets - * escaped). + * escaped), or be empty (or else a separating ',' preceding it can + * escape a separating ',' following it). + *=20 */ static bool is_valid_option_list(const char *optarg) { size_t len =3D strlen(optarg); size_t i; =20 - if (optarg[0] =3D=3D ',') { + if (!optarg[0] || optarg[0] =3D=3D ',') { return false; } =20 --=20 2.21.1