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xilinx_spips: Correct usage of an uninitialized local variable 

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>
Message-id: 20180124215708.30400-1-frasse.iglesias@gmail.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Francisco Iglesias 2018-01-25 11:45:30 +00:00 committed by Peter Maydell
parent 02e57e1c14
commit fbe5dac7b2
1 changed files with 17 additions and 1 deletions
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18
hw/ssi/xilinx_spips.c
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@ -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];