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-rw-r--r--src/soc/amd/common/block/spi/fch_spi_flash.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/soc/amd/common/block/spi/fch_spi_flash.c b/src/soc/amd/common/block/spi/fch_spi_flash.c
index d8eeefc7ed..b05c1a4a14 100644
--- a/src/soc/amd/common/block/spi/fch_spi_flash.c
+++ b/src/soc/amd/common/block/spi/fch_spi_flash.c
@@ -40,7 +40,8 @@ int fch_spi_flash_cmd_write(const u8 *cmd, size_t cmd_len, const void *data, siz
int ret;
u8 buff[SPI_FIFO_DEPTH + 1];
- if ((cmd_len + data_len) > SPI_FIFO_DEPTH)
+ /* Ensure FIFO is large enough. First byte of command does not go in the FIFO. */
+ if ((cmd_len - 1 + data_len) > SPI_FIFO_DEPTH)
return -1;
memcpy(buff, cmd, cmd_len);
memcpy(buff + cmd_len, data, data_len);