From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A3EB21ED4F for ; Tue, 25 Jul 2023 11:46:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 21662C433C7; Tue, 25 Jul 2023 11:46:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1690285598; bh=2uQL/F6/hJ52Pd3GlZgRHGNkwwdzsw1fMacJfJA+ayM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bRyklsAGwZF+dKIiKX09ybb7YDeIVvKi/91L9PilZ1UjXsJnh7EnswDHgOnTkLVm6 3TnUeTKt18R0m6rvJdbyF/pkmP4Chiy5FcFydvh0l1AkGsg8l9xJlZ2Pvhrr+p2R7M FDjs57cY5tYcEdFKjht30ncONu3FQlZJ+SbsMeUc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Krzysztof Kozlowski , Andi Shyti , Christophe JAILLET , Jiri Slaby Subject: [PATCH 5.4 263/313] tty: serial: samsung_tty: Fix a memory leak in s3c24xx_serial_getclk() when iterating clk Date: Tue, 25 Jul 2023 12:46:56 +0200 Message-ID: <20230725104532.433146088@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230725104521.167250627@linuxfoundation.org> References: <20230725104521.167250627@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Christophe JAILLET 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: # v3.3+ Reviewed-by: Krzysztof Kozlowski Reviewed-by: Andi Shyti Fixes: 5f5a7a5578c5 ("serial: samsung: switch to clkdev based clock lookup") Signed-off-by: Christophe JAILLET Reviewed-by: Jiri Slaby Message-ID: Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/samsung.c | 8 ++++++++ 1 file changed, 8 insertions(+) --- a/drivers/tty/serial/samsung.c +++ b/drivers/tty/serial/samsung.c @@ -1230,10 +1230,18 @@ 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); } }