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b=KHulftrI9MTm9d69U8WRpgaTShMBVcHRyGB9Tjb9phUS5R4jeJBlXM4iGwOJyASm0fThFD g7hAEa0uZAF5L0oqbFlHoxDQzRwPUnkcQwu71KUldFMZ4ZXf+eYcr/8EyHtTk4uuPi3Pva AkfwwkVkq0NrnI4p8U/34H5v5l8dnF4= X-MC-Unique: cn6Wd7jOOtOXkIdKTQk0cA-1 From: P J P To: Paolo Bonzini Subject: [PATCH v3] exec: set map length to zero when returning NULL Date: Tue, 26 May 2020 13:20:42 +0530 Message-Id: <20200526075042.420162-1-ppandit@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 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=ppandit@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/26 01:51:57 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] 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, DKIMWL_WL_HIGH=0.001, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: Fam Zheng , Prasad J Pandit , QEMU Developers , Alexander Bulekov , Ding Ren , =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= 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" From: Prasad J Pandit When mapping physical memory into host's virtual address space, 'address_space_map' may return NULL if BounceBuffer is in_use. Set and return '*plen =3D 0' to avoid later NULL pointer dereference. Reported-by: Alexander Bulekov Fixes: https://bugs.launchpad.net/qemu/+bug/1878259 Signed-off-by: Prasad J Pandit Reviewed-by: Philippe Mathieu-Daud=C3=A9 Suggested-by: Paolo Bonzini --- exec.c | 1 + 1 file changed, 1 insertion(+) Update v3: set *plen =3D 0; -> https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg06249.html diff --git a/exec.c b/exec.c index 5162f0d12f..4eea84bf66 100644 --- a/exec.c +++ b/exec.c @@ -3538,6 +3538,7 @@ void *address_space_map(AddressSpace *as, =20 if (!memory_access_is_direct(mr, is_write)) { if (atomic_xchg(&bounce.in_use, true)) { + *plen =3D 0; return NULL; } /* Avoid unbounded allocations */ --=20 2.26.2