[14/17] gdbstub: Check if gdb_regs is NULL

Commit Message

Alex Bennée Oct. 28, 2023, 10:33 a.m. UTC

From: Akihiko Odaki <[e-mail]>

cpu->gdb_regs may be NULL if no coprocessor is registered.

Fixes: 73c392c26b ("gdbstub: Replace gdb_regs with an array")
Signed-off-by: Akihiko Odaki <[e-mail]>
Message-Id: <[e-mail]>
Signed-off-by: Alex Bennée <[e-mail]>
Tested-by: Fabiano Rosas <[e-mail]>
---
 gdbstub/gdbstub.c | 34 ++++++++++++++++++++--------------
 1 file changed, 20 insertions(+), 14 deletions(-)

Comments

Richard Henderson Oct. 28, 2023, 7:30 p.m. UTC | #1

On 10/28/23 03:33, Alex Bennée wrote:
> From: Akihiko Odaki <[e-mail]>
> 
> cpu->gdb_regs may be NULL if no coprocessor is registered.
> 
> Fixes: 73c392c26b ("gdbstub: Replace gdb_regs with an array")
> Signed-off-by: Akihiko Odaki <[e-mail]>
> Message-Id: <[e-mail]>
> Signed-off-by: Alex Bennée <[e-mail]>
> Tested-by: Fabiano Rosas <[e-mail]>
> ---
>   gdbstub/gdbstub.c | 34 ++++++++++++++++++++--------------
>   1 file changed, 20 insertions(+), 14 deletions(-)

I ran into the same thing myself recently.

Reviewed-by: Richard Henderson <[e-mail]>
Tested-by: Richard Henderson <[e-mail]>


r~

Patch

diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index 1e96a71c0c..29540a0284 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -385,12 +385,14 @@  static const char *get_feature_xml(const char *p, const char **newp,
                 xml,
                 g_markup_printf_escaped("<xi:include href=\"%s\"/>",
                                         cc->gdb_core_xml_file));
-            for (guint i = 0; i < cpu->gdb_regs->len; i++) {
-                r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i);
-                g_ptr_array_add(
-                    xml,
-                    g_markup_printf_escaped("<xi:include href=\"%s\"/>",
-                                            r->xml));
+            if (cpu->gdb_regs) {
+                for (guint i = 0; i < cpu->gdb_regs->len; i++) {
+                    r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i);
+                    g_ptr_array_add(
+                        xml,
+                        g_markup_printf_escaped("<xi:include href=\"%s\"/>",
+                                                r->xml));
+                }
             }
             g_ptr_array_add(xml, g_strdup("</target>"));
             g_ptr_array_add(xml, NULL);
@@ -430,10 +432,12 @@  static int gdb_read_register(CPUState *cpu, GByteArray *buf, int reg)
         return cc->gdb_read_register(cpu, buf, reg);
     }
 
-    for (guint i = 0; i < cpu->gdb_regs->len; i++) {
-        r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i);
-        if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
-            return r->get_reg(env, buf, reg - r->base_reg);
+    if (cpu->gdb_regs) {
+        for (guint i = 0; i < cpu->gdb_regs->len; i++) {
+            r = &g_array_index(cpu->gdb_regs, GDBRegisterState, i);
+            if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
+                return r->get_reg(env, buf, reg - r->base_reg);
+            }
         }
     }
     return 0;
@@ -449,10 +453,12 @@  static int gdb_write_register(CPUState *cpu, uint8_t *mem_buf, int reg)
         return cc->gdb_write_register(cpu, mem_buf, reg);
     }
 
-    for (guint i = 0; i < cpu->gdb_regs->len; i++) {
-        r =  &g_array_index(cpu->gdb_regs, GDBRegisterState, i);
-        if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
-            return r->set_reg(env, mem_buf, reg - r->base_reg);
+    if (cpu->gdb_regs) {
+        for (guint i = 0; i < cpu->gdb_regs->len; i++) {
+            r =  &g_array_index(cpu->gdb_regs, GDBRegisterState, i);
+            if (r->base_reg <= reg && reg < r->base_reg + r->num_regs) {
+                return r->set_reg(env, mem_buf, reg - r->base_reg);
+            }
         }
     }
     return 0;