objtool, spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq()

If speed_hz < AMD_SPI_MIN_HZ, amd_set_spi_freq() iterates over the
entire amd_spi_freq array without breaking out early, causing 'i' to go
beyond the array bounds.

Fix that by stopping the loop when it gets to the last entry, so the low
speed_hz value gets clamped up to AMD_SPI_MIN_HZ.

Fixes the following warning with an UBSAN kernel:

  drivers/spi/spi-amd.o: error: objtool: amd_set_spi_freq() falls through to next function amd_spi_set_opcode()

Fixes: 3fe26121dc3a ("spi: amd: Configure device speed")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Mark Brown <broonie@kernel.org>
Cc: Raju Rangoju <Raju.Rangoju@amd.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lore.kernel.org/r/78fef0f2434f35be9095bcc9ffa23dd8cab667b9.1742852847.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/r/202503161828.RUk9EhWx-lkp@intel.com/

diff --git a/drivers/spi/spi-amd.c b/drivers/spi/spi-amd.c
index c85997478b81903c97636d271baf7d378914c50a..17fc0b17e756dd90b07399cf388df269c967d55c 100644 (file)
--- a/drivers/spi/spi-amd.c
+++ b/drivers/spi/spi-amd.c
@@ -302,7 +302,7 @@ static void amd_set_spi_freq(struct amd_spi *amd_spi, u32 speed_hz)
 {
        unsigned int i, spd7_val, alt_spd;
 
-       for (i = 0; i < ARRAY_SIZE(amd_spi_freq); i++)
+       for (i = 0; i < ARRAY_SIZE(amd_spi_freq)-1; i++)
                if (speed_hz >= amd_spi_freq[i].speed_hz)
                        break;