nvram: add nrf51_soc flash read method

Add nrf51_soc mmio read method to avoid NULL pointer dereference
issue.

Reported-by: Lei Sun <slei.casper@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Message-Id: <20200811114133.672647-6-ppandit@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/hw/nvram/nrf51_nvm.c b/hw/nvram/nrf51_nvm.c
index f2283c1a8d4aa27382c3538c1d44ec50397e915b..7b3460d52da4deeada4ecb7107f84afb0385f4e8 100644 (file)
--- a/hw/nvram/nrf51_nvm.c
+++ b/hw/nvram/nrf51_nvm.c
@@ -273,6 +273,15 @@ static const MemoryRegionOps io_ops = {
         .endianness = DEVICE_LITTLE_ENDIAN,
 };
 
+static uint64_t flash_read(void *opaque, hwaddr offset, unsigned size)
+{
+    /*
+     * This is a rom_device MemoryRegion which is always in
+     * romd_mode (we never put it in MMIO mode), so reads always
+     * go directly to RAM and never come here.
+     */
+    g_assert_not_reached();
+}
 
 static void flash_write(void *opaque, hwaddr offset, uint64_t value,
         unsigned int size)
@@ -300,6 +309,7 @@ static void flash_write(void *opaque, hwaddr offset, uint64_t value,
 
 
 static const MemoryRegionOps flash_ops = {
+    .read = flash_read,
     .write = flash_write,
     .valid.min_access_size = 4,
     .valid.max_access_size = 4,