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bh=ksW9NEbGcbCFsYzLrywmAnxhLCHKW+VH0kaIFBT1NXc=; b=Y8yJUkppFm0doHjFaDOIqkl7kS2o6Qs3kirdk6YEmYiKaQv/nCF8+szPyk6QqykpQk3bLA T8xkpw/XEMZGkXLrXAh8b6rc+6Ud785ACMlsMfPgNalJbEQdH2vQqD0vF45DE7xQbpjw3I 1lTjyepPK09Kx5iG1yliFTfu0gFhsUY= X-MC-Unique: 1j4MktGkMAWRmOlPAyZN1A-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PULL 1/5] nbd: Avoid off-by-one in long export name truncation Date: Mon, 13 Jul 2020 09:21:02 -0500 Message-Id: <20200713142106.261809-2-eblake@redhat.com> In-Reply-To: <20200713142106.261809-1-eblake@redhat.com> References: <20200713142106.261809-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 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=207.211.31.120; envelope-from=eblake@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/13 02:19:41 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -40 X-Spam_score: -4.1 X-Spam_bar: ---- X-Spam_report: (-4.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-1, 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: Kevin Wolf , Vladimir Sementsov-Ogievskiy , "open list:Network Block Dev..." , Max Reitz 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" When snprintf returns the same value as the buffer size, the final byte was truncated to ensure a NUL terminator. Fortunately, such long export names are unusual enough, with no real impact other than what is displayed to the user. Fixes: 5c86bdf12089 Reported-by: Max Reitz Signed-off-by: Eric Blake Message-Id: <20200622210355.414941-1-eblake@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy --- block/nbd.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/nbd.c b/block/nbd.c index c297336ffc5f..65a4f56924ec 100644 --- a/block/nbd.c +++ b/block/nbd.c @@ -2002,7 +2002,7 @@ static void nbd_refresh_filename(BlockDriverState *bs) len =3D snprintf(bs->exact_filename, sizeof(bs->exact_filename), "nbd://%s:%s", host, port); } - if (len > sizeof(bs->exact_filename)) { + if (len >=3D sizeof(bs->exact_filename)) { /* Name is too long to represent exactly, so leave it empty. */ bs->exact_filename[0] =3D '\0'; } --=20 2.27.0