[Qemu-devel] [PATCH v3] xilinx_spips: Correct usage of an uninitialized local variable

[Francisco Iglesias <frasse.iglesias@gmail.com>]

Coverity found that the variable tx_rx in the function
xilinx_spips_flush_txfifo was being used uninitialized (CID 1383841). This
patch corrects this by always initializing tx_rx to zeros.

Signed-off-by: Francisco Iglesias <frasse.iglesias@gmail.com>

---
v3. Change to report errors on the num_busses property via the Error**
    parameter when realizing the devices.
---
v2. Add a sanity check on the num_busses property when realizing the
    devices.
---
 hw/ssi/xilinx_spips.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/hw/ssi/xilinx_spips.c b/hw/ssi/xilinx_spips.c
index 85c5d0c..8af36ca 100644
--- a/hw/ssi/xilinx_spips.c
+++ b/hw/ssi/xilinx_spips.c
@@ -210,6 +210,9 @@
 #define SNOOP_NONE 0xEE
 #define SNOOP_STRIPING 0
 
+#define MIN_NUM_BUSSES 1
+#define MAX_NUM_BUSSES 2
+
 static inline int num_effective_busses(XilinxSPIPS *s)
 {
     return (s->regs[R_LQSPI_CFG] & LQSPI_CFG_SEP_BUS &&
@@ -573,7 +576,7 @@ static void xilinx_spips_flush_txfifo(XilinxSPIPS *s)
     for (;;) {
         int i;
         uint8_t tx = 0;
-        uint8_t tx_rx[num_effective_busses(s)];
+        uint8_t tx_rx[MAX_NUM_BUSSES] = { 0 };
         uint8_t dummy_cycles = 0;
         uint8_t addr_length;
 
@@ -1221,6 +1224,19 @@ static void xilinx_spips_realize(DeviceState *dev, Error **errp)
 
     DB_PRINT_L(0, "realized spips\n");
 
+    if (s->num_busses > MAX_NUM_BUSSES) {
+        error_setg(errp,
+                   "requested number of SPI busses %u exceeds maximum %d",
+                   s->num_busses, MAX_NUM_BUSSES);
+        return;
+    }
+    if (s->num_busses < MIN_NUM_BUSSES) {
+        error_setg(errp,
+                   "requested number of SPI busses %u is below minimum %d",
+                   s->num_busses, MIN_NUM_BUSSES);
+        return;
+    }
+
     s->spi = g_new(SSIBus *, s->num_busses);
     for (i = 0; i < s->num_busses; ++i) {
         char bus_name[16];
-- 
2.9.3