diff mbox series

[PULL,19/26] target/ppc: powerpc_excp: Add excp_vectors bounds check

Message ID 20220104073121.3784280-20-clg@kaod.org (mailing list archive)
State New, archived
Headers show
Series [PULL,01/26] ppc/pnv: Change the maximum of PHB3 devices for Power8NVL | expand

Commit Message

Cédric Le Goater Jan. 4, 2022, 7:31 a.m. UTC 
From: Fabiano Rosas <farosas@linux.ibm.com>

The next patch will start accessing the excp_vectors array earlier in
the function, so add a bounds check as first thing here.

This converts the empty return on POWERPC_EXCP_NONE to an error. This
exception number never reaches this function and if it does it
probably means something else went wrong up the line.

Signed-off-by: Fabiano Rosas <farosas@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Message-Id: <20211229165751.3774248-3-farosas@linux.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
 target/ppc/excp_helper.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/target/ppc/excp_helper.c b/target/ppc/excp_helper.c
index c7efbdc3051b..9e7c428821e1 100644
--- a/target/ppc/excp_helper.c
+++ b/target/ppc/excp_helper.c
@@ -372,6 +372,10 @@  static void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
     target_ulong msr, new_msr, vector;
     int srr0, srr1, lev = -1;
 
+    if (excp <= POWERPC_EXCP_NONE || excp >= POWERPC_EXCP_NB) {
+        cpu_abort(cs, "Invalid PowerPC exception %d. Aborting\n", excp);
+    }
+
     qemu_log_mask(CPU_LOG_INT, "Raise exception at " TARGET_FMT_lx
                   " => %s (%d) error=%02x\n", env->nip, powerpc_excp_name(excp),
                   excp, env->error_code);
@@ -426,9 +430,6 @@  static void powerpc_excp(PowerPCCPU *cpu, int excp_model, int excp)
 #endif
 
     switch (excp) {
-    case POWERPC_EXCP_NONE:
-        /* Should never happen */
-        return;
     case POWERPC_EXCP_CRITICAL:    /* Critical input                         */
         switch (excp_model) {
         case POWERPC_EXCP_40x: