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tty: serial: samsung_tty: Fix a memory leak in s3c24xx_serial_getclk() when iterating clk

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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@vger.kernel.org> # v3.3+
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Fixes: 5f5a7a5578 ("serial: samsung: switch to clkdev based clock lookup")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Message-ID: <cf3e0053d2fc7391b2d906a86cd01a5ef15fb9dc.1686412569.git.christophe.jaillet@wanadoo.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christophe JAILLET 2023-06-10 17:59:26 +02:00 committed by Greg Kroah-Hartman
parent a9c09546e9
commit 832e231cff
1 changed files with 8 additions and 0 deletions
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8
drivers/tty/serial/samsung_tty.c
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@ -1490,10 +1490,18 @@ 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);
}
}