hw/s390x/sclp: Do not ignore address_space_read/write() errors

If address_space_read() fails, return PGM_ADDRESSING. In the
unlikely case address_space_write() fails (we already checked
the address is readable), return PGM_PROTECTION.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Jason J. Herne <jjherne@linux.ibm.com>
Message-Id: <20251007015802.24748-1-philmd@linaro.org>

diff --git a/hw/s390x/sclp.c b/hw/s390x/sclp.c
index 51e88ba8f1214633e90435db3d583a21a70b8d3d..8602a566a49370864e898726cb5d648f403c2f22 100644 (file)
--- a/hw/s390x/sclp.c
+++ b/hw/s390x/sclp.c
@@ -306,6 +306,7 @@ int sclp_service_call(S390CPU *cpu, uint64_t sccb, uint32_t code)
     g_autofree SCCB *work_sccb = NULL;
     AddressSpace *as = CPU(cpu)->as;
     const MemTxAttrs attrs = MEMTXATTRS_UNSPECIFIED;
+    MemTxResult ret;
 
     /* first some basic checks on program checks */
     if (env->psw.mask & PSW_MASK_PSTATE) {
@@ -320,7 +321,10 @@ int sclp_service_call(S390CPU *cpu, uint64_t sccb, uint32_t code)
     }
 
     /* the header contains the actual length of the sccb */
-    address_space_read(as, sccb, attrs, &header, sizeof(SCCBHeader));
+    ret = address_space_read(as, sccb, attrs, &header, sizeof(SCCBHeader));
+    if (ret != MEMTX_OK) {
+        return -PGM_ADDRESSING;
+    }
 
     /* Valid sccb sizes */
     if (be16_to_cpu(header.length) < sizeof(SCCBHeader)) {
@@ -333,7 +337,11 @@ int sclp_service_call(S390CPU *cpu, uint64_t sccb, uint32_t code)
      * the host has checked the values
      */
     work_sccb = g_malloc0(be16_to_cpu(header.length));
-    address_space_read(as, sccb, attrs, work_sccb, be16_to_cpu(header.length));
+    ret = address_space_read(as, sccb, attrs,
+                            work_sccb, be16_to_cpu(header.length));
+    if (ret != MEMTX_OK) {
+        return -PGM_ADDRESSING;
+    }
 
     if (!sclp_command_code_valid(code)) {
         work_sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_SCLP_COMMAND);
@@ -347,7 +355,11 @@ int sclp_service_call(S390CPU *cpu, uint64_t sccb, uint32_t code)
 
     sclp_c->execute(sclp, work_sccb, code);
 out_write:
-    address_space_write(as, sccb, attrs, work_sccb, be16_to_cpu(header.length));
+    ret = address_space_write(as, sccb, attrs,
+                              work_sccb, be16_to_cpu(header.length));
+    if (ret != MEMTX_OK) {
+        return -PGM_PROTECTION;
+    }
 
     sclp_c->service_interrupt(sclp, sccb);