From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xulin Sun , Alexandre Belloni , Sasha Levin Subject: [PATCH 4.9 31/92] rtc: pcf2127: fix a kmemleak caused in pcf2127_i2c_gather_write Date: Thu, 29 Nov 2018 15:12:00 +0100 Message-Id: <20181129140108.955413577@linuxfoundation.org> In-Reply-To: <20181129140106.520639693@linuxfoundation.org> References: <20181129140106.520639693@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ [ Upstream commit 9bde0afb7a906f1dabdba37162551565740b862d ] pcf2127_i2c_gather_write() allocates memory as local variable for i2c_master_send(), after finishing the master transfer, the allocated memory should be freed. The kmemleak is reported: unreferenced object 0xffff80231e7dba80 (size 64): comm "hwclock", pid 27762, jiffies 4296880075 (age 356.944s) hex dump (first 32 bytes): 03 00 12 03 19 02 11 13 00 80 98 18 00 00 ff ff ................ 00 50 00 00 00 00 00 00 02 00 00 00 00 00 00 00 .P.............. backtrace: [] create_object+0xf8/0x278 [] kmemleak_alloc+0x74/0xa0 [] __kmalloc+0x1ac/0x348 [] pcf2127_i2c_gather_write+0x54/0xf8 [] _regmap_raw_write+0x464/0x850 [] regmap_bulk_write+0x1a4/0x348 [] pcf2127_rtc_set_time+0xac/0xe8 [] rtc_set_time+0x80/0x138 [] rtc_dev_ioctl+0x398/0x610 [] do_vfs_ioctl+0xb0/0x848 [] SyS_ioctl+0x8c/0xa8 [] el0_svc_naked+0x34/0x38 [] 0xffffffffffffffff Signed-off-by: Xulin Sun Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin --- drivers/rtc/rtc-pcf2127.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/rtc/rtc-pcf2127.c b/drivers/rtc/rtc-pcf2127.c index 2bfdf638b673..8a3667e761dd 100644 --- a/drivers/rtc/rtc-pcf2127.c +++ b/drivers/rtc/rtc-pcf2127.c @@ -237,6 +237,9 @@ static int pcf2127_i2c_gather_write(void *context, memcpy(buf + 1, val, val_size); ret = i2c_master_send(client, buf, val_size + 1); + + kfree(buf); + if (ret != val_size + 1) return ret < 0 ? ret : -EIO; -- 2.17.1