From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 C3C0936D4E1; Wed, 30 Sep 2026 18:15:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792144; cv=none; b=iPuFsrvUHt8jR8EDYn7nD+V4OkRMIIbDVm7tQNKuck5tTJlxBUspGbx+C8as57vg8xM8b6iaidOqcxbkUQhBZ8V8egIIRRgv5/D3GGKcTyZQ+OLrWqq98kRULW3OMTlet6dmcwxi5Y+jLF7DBTKDI6FRFS+TWH45YMG483OOyiA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790792144; c=relaxed/simple; bh=9DHvfjEby2G4+U2nGW+y6RdbzXAmNMry+4ETup6LSgg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Qzq1uHwT5waiZm02FXt2ReIyjhkkwI9CVwd2eBoQ6i2hcuPzeJx9XFz0605C3xslc18rq9USQjcvOqZYoGpXY8XfSrUaOcQJz1svx5KpOSqR36hsnJDQoTEnNJqoNAdbDrVyj5R/BEtdytsrttZFGKZf5YdM3zLFJlQXZ65xYuI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gqkAEs4M; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="gqkAEs4M" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0ACBB1F000FF; Wed, 30 Sep 2026 18:15:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790792143; bh=6EaGgppLJG3D3jv84Lg1qTSt6SG6aXLi5o5dU+DvDis=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=gqkAEs4MW5hnCYhjWDZ7aI19M18trR+zL9+kW2BKcg2kyR+938tsD43FzvRfBRNCP SHnh5MiOYlPAdBNclzIY3/Efeph6OyKnlft6GDfmqfADGsxY/czyO4iBVbAD+KMP9f ngBUgZDbKNR1/hAJOn+voQNhz5Lw8ktRsJrkAPvo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Felix Gu , Ulf Hansson Subject: [PATCH 5.15 549/752] mmc: sdio_uart: fix xmit_fifo leak when the port table is full Date: Wed, 30 Sep 2026 17:26:59 +0200 Message-ID: <20260930152410.124181249@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152358.131179731@linuxfoundation.org> References: <20260930152358.131179731@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Felix Gu commit 53823e25793a97d07e6e98e0904bbf74cac8bc76 upstream. sdio_uart_add_port() allocates the transmit fifo before claiming a slot in sdio_uart_table[]. When all UART_NR slots are taken, it returns -EBUSY with the fifo still allocated, but the probe error path only kfree()s the port, leaking the transmit fifo. Free the fifo in the failure path of sdio_uart_add_port() itself so the function retains nothing on error. Fixes: 8b197a5ce7a7 ("sdio_uart: Use kfifo instead of the messy circ stuff") Signed-off-by: Felix Gu Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/core/sdio_uart.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/mmc/core/sdio_uart.c +++ b/drivers/mmc/core/sdio_uart.c @@ -103,6 +103,9 @@ static int sdio_uart_add_port(struct sdi } spin_unlock(&sdio_uart_table_lock); + if (ret) + kfifo_free(&port->xmit_fifo); + return ret; }