[PATCH] spi: spi-loopback-test: Fix out-of-bounds read

[Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>]

The "tx/rx-transfer - crossing PAGE_SIZE" test always fails when
len=131071 and rx_offset >= 5:

 spi-loopback-test spi0.0: Running test tx/rx-transfer - crossing PAGE_SIZE
 ...
   with iteration values: len = 131071, tx_off = 0, rx_off = 3
   with iteration values: len = 131071, tx_off = 0, rx_off = 4
   with iteration values: len = 131071, tx_off = 0, rx_off = 5
 loopback strangeness - rx changed outside of allowed range at: ...a4321000
   spi_msg@ffffffd5a4157690
     frame_length:  131071
     actual_length: 131071
     spi_transfer@ffffffd5a41576f8
       len:    131071
       tx_buf: ffffffd5a4340ffc

Note that rx_offset > 3 can only occur if the SPI controller driver sets
->dma_alignment to a higher value than 4, so most SPI controller drivers
are not affect.

The allocated Rx buffer is of size SPI_TEST_MAX_SIZE_PLUS, which is 132
KiB (assuming 4 KiB pages).  This test uses an initial offset into the
rx_buf of PAGE_SIZE - 4, and a len of 131071, so the range expected to
be written in this transfer ends at (4096 - 4) + 5 + 131071 == 132 KiB,
which is also the end of the allocated buffer.  But the code which
verifies the content of the buffer reads a byte beyond the allocated
buffer and spuriously fails because this out-of-bounds read doesn't
return the expected value.

Fix this by using ITERATE_LEN instead of ITERATE_MAX_LEN to avoid
testing sizes which cause out-of-bounds reads.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@xxxxxxxx>
---
 drivers/spi/spi-loopback-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-loopback-test.c b/drivers/spi/spi-loopback-test.c
index 9522d1b5786d..df981e55c24c 100644
--- a/drivers/spi/spi-loopback-test.c
+++ b/drivers/spi/spi-loopback-test.c
@@ -90,7 +90,7 @@ static struct spi_test spi_tests[] = {
 	{
 		.description	= "tx/rx-transfer - crossing PAGE_SIZE",
 		.fill_option	= FILL_COUNT_8,
-		.iterate_len    = { ITERATE_MAX_LEN },
+		.iterate_len    = { ITERATE_LEN },
 		.iterate_tx_align = ITERATE_ALIGN,
 		.iterate_rx_align = ITERATE_ALIGN,
 		.transfer_count = 1,
-- 
2.28.0