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bh=wH9qFb1vz2F+UQwonoBfny/s8QXIKAguywZ3WwtIZ4Y=; b=R+7mlO5pNB5eIc4L8qxat0S6o7S+XHa6FnsM38HM38+KRBG3cz5f4qjBPdEQxJI4e2ISzj WFdmcfohUwB6l8yo+SVZzbkpuMf5wlf+gox79LqNMrn6ye1wbrh3DFTU2rOvoAZeSKc0vE gXELUAtI8+weZxi1fjhlKjXxLeJyAik= X-MC-Unique: csiLGFbeOgWZNSc8JbmkmA-1 From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PULL 12/32] block/file-posix: Fix check_cache_dropped() error handling Date: Wed, 29 Apr 2020 09:20:28 +0200 Message-Id: <20200429072048.29963-13-armbru@redhat.com> In-Reply-To: <20200429072048.29963-1-armbru@redhat.com> References: <20200429072048.29963-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=205.139.110.61; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/04/29 00:53:13 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 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: Stefan Hajnoczi 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" The Error ** argument must be NULL, &error_abort, &error_fatal, or a pointer to a variable containing NULL. Passing an argument of the latter kind twice without clearing it in between is wrong: if the first call sets an error, it no longer points to NULL for the second call. check_cache_dropped() calls error_setg() in a loop. It fails to break the loop in one instance. If a subsequent iteration error_setg()s again, it trips error_setv()'s assertion. Fix it to break the loop. Fixes: 31be8a2a97ecba7d31a82932286489cac318e9e9 Cc: Stefan Hajnoczi Signed-off-by: Markus Armbruster Reviewed-by: Eric Blake Message-Id: <20200422130719.28225-3-armbru@redhat.com> Reviewed-by: Stefan Hajnoczi --- block/file-posix.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/block/file-posix.c b/block/file-posix.c index 7e19bbff5f..094e3b0212 100644 --- a/block/file-posix.c +++ b/block/file-posix.c @@ -2691,10 +2691,13 @@ static void check_cache_dropped(BlockDriverState *b= s, Error **errp) vec_end =3D DIV_ROUND_UP(length, page_size); for (i =3D 0; i < vec_end; i++) { if (vec[i] & 0x1) { - error_setg(errp, "page cache still in use!"); break; } } + if (i < vec_end) { + error_setg(errp, "page cache still in use!"); + break; + } } =20 if (window) { --=20 2.21.1