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Thu, 18 Jun 2026 06:34:01 -0700 (PDT) From: Matt Turner To: qemu-devel@nongnu.org Cc: Richard Henderson , Laurent Vivier , Helge Deller , Pierrick Bouvier , Max Filippov , Matt Turner Subject: [PATCH] linux-user/xtensa: fix unlock of uninitialized frame pointer on sigreturn Date: Thu, 18 Jun 2026 09:33:53 -0400 Message-ID: <20260618133354.3369437-1-mattst88@gmail.com> X-Mailer: git-send-email 2.53.0 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=lists1p.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::1136; envelope-from=mattst88@gmail.com; helo=mail-yw1-x1136.google.com X-Spam_score_int: -17 X-Spam_score: -1.8 X-Spam_bar: - X-Spam_report: (-1.8 / 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_ENVFROM_END_DIGIT=0.25, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.29 Precedence: list List-Id: qemu development 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: 1781789661358158500 Content-Type: text/plain; charset="utf-8" If lock_user_struct fails, frame is uninitialized but the badframe label unconditionally calls unlock_user_struct on it. Handle the lock failure inline so badframe is only reached with a valid lock. Signed-off-by: Matt Turner Reviewed-by: Helge Deller --- linux-user/xtensa/signal.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git ./linux-user/xtensa/signal.c ./linux-user/xtensa/signal.c index e3f9da322b..4990c50045 100644 --- ./linux-user/xtensa/signal.c +++ ./linux-user/xtensa/signal.c @@ -355,7 +355,8 @@ long do_rt_sigreturn(CPUXtensaState *env) =20 trace_user_do_rt_sigreturn(env, frame_addr); if (!lock_user_struct(VERIFY_READ, frame, frame_addr, 1)) { - goto badframe; + force_sig(TARGET_SIGSEGV); + return -QEMU_ESIGRETURN; } target_to_host_sigset(&set, &frame->uc.tuc_sigmask); set_sigmask(&set); --=20 2.53.0