spi: tegra210-quad: Avoid shift-out-of-bounds

A shift-out-of-bounds issue was identified by UBSAN in the
tegra_qspi_fill_tx_fifo_from_client_txbuf() function.

	 UBSAN: shift-out-of-bounds in drivers/spi/spi-tegra210-quad.c:345:27
	 shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int')
	 Call trace:
	  tegra_qspi_start_cpu_based_transfer

The problem arises when shifting the contents of tx_buf left by 8 times
the value of i, which can exceed 4 and result in an exponent larger than
32 bits.

Resolve this by restrict the value of i to be less than 4, preventing
the shift operation from overflowing.

Signed-off-by: Breno Leitao <leitao@debian.org>
Fixes: 921fc1838fb0 ("spi: tegra210-quad: Add support for Tegra210 QSPI controller")
Link: https://patch.msgid.link/20241004125400.1791089-1-leitao@debian.org
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c
index 40f2afa..08e49a8 100644 (file)
--- a/drivers/spi/spi-tegra210-quad.c
+++ b/drivers/spi/spi-tegra210-quad.c
@@ -341,7 +341,7 @@ tegra_qspi_fill_tx_fifo_from_client_txbuf(struct tegra_qspi *tqspi, struct spi_t
                for (count = 0; count < max_n_32bit; count++) {
                        u32 x = 0;
 
-                       for (i = 0; len && (i < bytes_per_word); i++, len--)
+                       for (i = 0; len && (i < min(4, bytes_per_word)); i++, len--)
                                x |= (u32)(*tx_buf++) << (i * 8);
                        tegra_qspi_writel(tqspi, x, QSPI_TX_FIFO);
                }