prevent a bad shift operation by verifying that the argument to fls is non zero. Reported-by: "Vabhav Sharma (OSS)" <vabhav.sharma@xxxxxxxxxxx> Signed-off-by: B K Karthik <bkkarthik@xxxxxxxxxxxx> --- v1 -> v2: added Reported-by tag drivers/tty/serial/fsl_lpuart.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c index 7ca642249224..0cc64279cd2d 100644 --- a/drivers/tty/serial/fsl_lpuart.c +++ b/drivers/tty/serial/fsl_lpuart.c @@ -1168,7 +1168,8 @@ static inline int lpuart_start_rx_dma(struct lpuart_port *sport) * 10ms at any baud rate. */ sport->rx_dma_rng_buf_len = (DMA_RX_TIMEOUT * baud / bits / 1000) * 2; - sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1)); + if (sport->rx_dma_rng_buf_len != 0) + sport->rx_dma_rng_buf_len = (1 << (fls(sport->rx_dma_rng_buf_len) - 1)); if (sport->rx_dma_rng_buf_len < 16) sport->rx_dma_rng_buf_len = 16; -- 2.20.1
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