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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2001:4860:4864:20::2c; envelope-from=danielhb413@gmail.com; helo=mail-oa1-x2c.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 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, 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1659027441434100001 Content-Type: text/plain; charset="utf-8" spapr_nvdimm_flush_completion_cb() and flush_worker_cb() are using the DRC object returned by spapr_drc_index() without checking it for NULL. In this case we would be dereferencing a NULL pointer when doing SPAPR_NVDIMM(drc->dev) and PC_DIMM(drc->dev). This can happen if, during a scm_flush(), the DRC object is wrongly freed/released (e.g. a bug in another part of the code). spapr_drc_index() would then return NULL in the callbacks. Fixes: Coverity CID 1487108, 1487178 Reviewed-by: Greg Kurz Message-Id: <20220409200856.283076-2-danielhb413@gmail.com> Signed-off-by: Daniel Henrique Barboza --- hw/ppc/spapr_nvdimm.c | 18 ++++++++++++++---- 1 file changed, 14 insertions(+), 4 deletions(-) diff --git a/hw/ppc/spapr_nvdimm.c b/hw/ppc/spapr_nvdimm.c index c4c97da5de..04a64cada3 100644 --- a/hw/ppc/spapr_nvdimm.c +++ b/hw/ppc/spapr_nvdimm.c @@ -447,9 +447,15 @@ static int flush_worker_cb(void *opaque) { SpaprNVDIMMDeviceFlushState *state =3D opaque; SpaprDrc *drc =3D spapr_drc_by_index(state->drcidx); - PCDIMMDevice *dimm =3D PC_DIMM(drc->dev); - HostMemoryBackend *backend =3D MEMORY_BACKEND(dimm->hostmem); - int backend_fd =3D memory_region_get_fd(&backend->mr); + PCDIMMDevice *dimm; + HostMemoryBackend *backend; + int backend_fd; + + g_assert(drc !=3D NULL); + + dimm =3D PC_DIMM(drc->dev); + backend =3D MEMORY_BACKEND(dimm->hostmem); + backend_fd =3D memory_region_get_fd(&backend->mr); =20 if (object_property_get_bool(OBJECT(backend), "pmem", NULL)) { MemoryRegion *mr =3D host_memory_backend_get_memory(dimm->hostmem); @@ -475,7 +481,11 @@ static void spapr_nvdimm_flush_completion_cb(void *opa= que, int hcall_ret) { SpaprNVDIMMDeviceFlushState *state =3D opaque; SpaprDrc *drc =3D spapr_drc_by_index(state->drcidx); - SpaprNVDIMMDevice *s_nvdimm =3D SPAPR_NVDIMM(drc->dev); + SpaprNVDIMMDevice *s_nvdimm; + + g_assert(drc !=3D NULL); + + s_nvdimm =3D SPAPR_NVDIMM(drc->dev); =20 state->hcall_ret =3D hcall_ret; QLIST_REMOVE(state, node); --=20 2.36.1