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Tue, 12 Mar 2024 00:18:16 +0000 (GMT) From: Ilya Leoshkevich To: =?utf-8?q?Alex_Benn=C3=A9e?= , Peter Maydell Cc: qemu-devel@nongnu.org, Ilya Leoshkevich Subject: [PATCH] gdbstub: Fix double close() of the follow-fork-mode socket Date: Tue, 12 Mar 2024 01:07:01 +0100 Message-ID: <20240312001813.13720-1-iii@linux.ibm.com> X-Mailer: git-send-email 2.44.0 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: lI2Cm5BKsgiIk9VNP1JBKr8sjvrMUmzj X-Proofpoint-GUID: lI2Cm5BKsgiIk9VNP1JBKr8sjvrMUmzj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1011,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2024-03-11_12,2024-03-11_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 clxscore=1015 phishscore=0 adultscore=0 impostorscore=0 bulkscore=0 mlxlogscore=995 spamscore=0 suspectscore=0 malwarescore=0 mlxscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311290000 definitions=main-2403120000 Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org When the terminal GDB_FORK_ENABLED state is reached, the coordination socket is not needed anymore and is therefore closed. However, if there is a communication error between QEMU gdbstub and GDB, the generic error handling code attempts to close it again. Fix by closing it later - before returning - instead. Fixes: Coverity CID 1539966 Fixes: d547e711a8a5 ("gdbstub: Implement follow-fork-mode child") Signed-off-by: Ilya Leoshkevich --- gdbstub/user.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/gdbstub/user.c b/gdbstub/user.c index 7f9f19a1249..08aed022e26 100644 --- a/gdbstub/user.c +++ b/gdbstub/user.c @@ -502,6 +502,7 @@ void gdbserver_fork_end(CPUState *cpu, pid_t pid) switch (gdbserver_user_state.fork_state) { case GDB_FORK_ENABLED: if (gdbserver_user_state.running_state) { + close(fd); return; } QEMU_FALLTHROUGH; @@ -527,7 +528,6 @@ void gdbserver_fork_end(CPUState *cpu, pid_t pid) gdbserver_user_state.fork_state = GDB_FORK_ACTIVE; break; case GDB_FORK_ENABLE: - close(fd); gdbserver_user_state.fork_state = GDB_FORK_ENABLED; break; case GDB_FORK_DISABLE: @@ -542,7 +542,6 @@ void gdbserver_fork_end(CPUState *cpu, pid_t pid) if (write(fd, &b, 1) != 1) { goto fail; } - close(fd); gdbserver_user_state.fork_state = GDB_FORK_ENABLED; break; case GDB_FORK_DISABLING: