From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Rosin Subject: [PATCH] i2c: smbus: kill memory leak on emulated and failed DMA SMBus xfers Date: Wed, 20 Jun 2018 11:43:23 +0200 Message-ID: <20180620094323.8447-1-peda@axentia.se> Mime-Version: 1.0 Content-Type: text/plain Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org Cc: Peter Rosin , Wolfram Sang , Jonathan Cameron , Wolfram Sang , linux-i2c@vger.kernel.org List-Id: linux-i2c@vger.kernel.org If DMA safe memory was allocated, but the subsequent I2C transfer fails the memory is leaked. Plug this leak. Fixes: 8a77821e74d6 ("i2c: smbus: use DMA safe buffers for emulated SMBus transactions") Signed-off-by: Peter Rosin --- drivers/i2c/i2c-core-smbus.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/i2c/i2c-core-smbus.c b/drivers/i2c/i2c-core-smbus.c index f3f683041e7f..51970bae3c4a 100644 --- a/drivers/i2c/i2c-core-smbus.c +++ b/drivers/i2c/i2c-core-smbus.c @@ -465,15 +465,18 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, status = i2c_transfer(adapter, msg, num); if (status < 0) - return status; - if (status != num) - return -EIO; + goto cleanup; + if (status != num) { + status = -EIO; + goto cleanup; + } + status = 0; /* Check PEC if last message is a read */ if (i && (msg[num-1].flags & I2C_M_RD)) { status = i2c_smbus_check_pec(partial_pec, &msg[num-1]); if (status < 0) - return status; + goto cleanup; } if (read_write == I2C_SMBUS_READ) @@ -499,12 +502,13 @@ static s32 i2c_smbus_xfer_emulated(struct i2c_adapter *adapter, u16 addr, break; } +cleanup: if (msg[0].flags & I2C_M_DMA_SAFE) kfree(msg[0].buf); if (msg[1].flags & I2C_M_DMA_SAFE) kfree(msg[1].buf); - return 0; + return status; } /** -- 2.11.0