[PATCH 01/10] hmp: don't crash on invalid register

["Marc-André Lureau" <marcandre.lureau@redhat.com>]

When printing an invalid/denied register, QEMU crashes with:
ERROR:include/qemu/bswap.h:488:ldn_le_p: code should not be reached

(ex: "p $sireg" when siselect=0 on riscv)

Return false instead.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 monitor/hmp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/monitor/hmp.c b/monitor/hmp.c
index 488ec23937df..10e19e417aba 100644
--- a/monitor/hmp.c
+++ b/monitor/hmp.c
@@ -424,7 +424,7 @@ static bool gdb_get_register(MonitorHMP *hmp, int64_t *pval, const char *name)
 
         buf = g_byte_array_new();
         reg_size = gdb_read_register(cs, buf, reg->gdb_reg);
-        if (reg_size > sizeof(*pval)) {
+        if (reg_size == 0 || reg_size > sizeof(*pval)) {
             return false;
         }
 

-- 
2.55.0.543.g5ebe2ebe4ea8