From: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
commit 832e231cff476102e8204a9e7bddfe5c6154a375 upstream.
When the best clk is searched, we iterate over all possible clk.
If we find a better match, the previous one, if any, needs to be freed.
If a better match has already been found, we still need to free the new
one, otherwise it leaks.
Cc: <stable@xxxxxxxxxxxxxxx> # v3.3+
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxx>
Fixes: 5f5a7a5578c5 ("serial: samsung: switch to clkdev based clock lookup")
Signed-off-by: Christophe JAILLET <christophe.jaillet@xxxxxxxxxx>
Reviewed-by: Jiri Slaby <jirislaby@xxxxxxxxxx>
Message-ID: <cf3e0053d2fc7391b2d906a86cd01a5ef15fb9dc.1686412569.git.christophe.jaillet@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/samsung_tty.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -1344,10 +1344,18 @@ static unsigned int s3c24xx_serial_getcl
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);
}
}
