| Message ID | f31523d7270d4a1f82d96b7891ed13e6@bfs.de |
|---|---|
| State | New |
| Headers | show |
| Series | AW: [PATCH 2/2] tty: serial: samsung_tty: Fix a memory leak in s3c24xx_serial_getclk() when iterating clk | expand |
diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c index dd751e7010e3..c07877dd25fa 100644 --- a/drivers/tty/serial/samsung_tty.c +++ b/drivers/tty/serial/samsung_tty.c @@ -1488,10 +1488,18 @@ static unsigned int s3c24xx_serial_getclk(struct s3c24xx_uart_port *ourport, calc_deviation = -calc_deviation; if (calc_deviation < deviation) { + /* + * If we find a better clk, release the previous one, if + * any. + */ + if (!IS_ERR(*best_clk)) + clk_put(*best_clk); *best_clk = clk; best_quot = quot; *clk_num = cnt; deviation = calc_deviation; + } else { + clk_put(clk); } }
while we are here .... perhaps INT_MAX from kernel.h ? int deviation = (1 << 30) - 1; the part before looks a bit strange if (ourport->info->has_divslot) { unsigned long div = rate / req_baud; /* The UDIVSLOT register on the newer UARTs allows us to * get a divisor adjustment of 1/16th on the baud clock. * * We don't keep the UDIVSLOT value (the 16ths we * calculated by not multiplying the baud by 16) as it * is easy enough to recalculate. */ quot = div / 16; baud = rate / div; because baud=rate/rate/req_baud = req_baud can this be simplyfied ? (or is the numeric required ?) Homebrew abs() kernel.h has a abs() can we use it here ? if (calc_deviation < 0) calc_deviation = -calc_deviation; to the patch: + /* + * If we find a better clk, release the previous one, if + * any. + */ + if (!IS_ERR(*best_clk)) + clk_put(*best_clk); the intentions are good. *best_clk is user supplied (and should be NULL) filled & released in the next round but IMHO must be valid (is clk). so no need to check. (ntl clk_put seems to handle NULL and ERR ) if (!clk || WARN_ON_ONCE(IS_ERR(clk))) return; JM2C wh