Hi Jie, url: https://github.com/0day-ci/linux/commits/Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013 base: https://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/for-next config: parisc-randconfig-m031-20200913 (attached as .config) compiler: hppa-linux-gcc (GCC) 9.3.0 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> smatch warnings: drivers/i2c/busses/i2c-virtio.c:160 virtio_i2c_xfer() error: we previously assumed 'vmsg' could be null (see line 137) # https://github.com/0day-ci/linux/commit/0a54ec771966748fcbc86256b830b5f786168b7d git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jie-Deng/i2c-virtio-add-a-virtio-i2c-frontend-driver/20200911-115013 git checkout 0a54ec771966748fcbc86256b830b5f786168b7d vim +/vmsg +160 drivers/i2c/busses/i2c-virtio.c 0a54ec77196674 Jie Deng 2020-09-11 109 static int virtio_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) 0a54ec77196674 Jie Deng 2020-09-11 110 { 0a54ec77196674 Jie Deng 2020-09-11 111 struct virtio_i2c *vi = i2c_get_adapdata(adap); 0a54ec77196674 Jie Deng 2020-09-11 112 struct virtqueue *vq = vi->vq; 0a54ec77196674 Jie Deng 2020-09-11 113 struct virtio_i2c_msg *vmsg; 0a54ec77196674 Jie Deng 2020-09-11 114 unsigned long time_left; 0a54ec77196674 Jie Deng 2020-09-11 115 int len, i, ret = 0; 0a54ec77196674 Jie Deng 2020-09-11 116 0a54ec77196674 Jie Deng 2020-09-11 117 mutex_lock(&vi->i2c_lock); 0a54ec77196674 Jie Deng 2020-09-11 118 vmsg = &vi->vmsg; 0a54ec77196674 Jie Deng 2020-09-11 119 vmsg->buf = NULL; 0a54ec77196674 Jie Deng 2020-09-11 120 0a54ec77196674 Jie Deng 2020-09-11 121 for (i = 0; i < num; i++) { 0a54ec77196674 Jie Deng 2020-09-11 122 ret = virtio_i2c_add_msg(vq, vmsg, &msgs[i]); 0a54ec77196674 Jie Deng 2020-09-11 123 if (ret) { 0a54ec77196674 Jie Deng 2020-09-11 124 dev_err(&adap->dev, "failed to add msg[%d] to virtqueue.\n", i); 0a54ec77196674 Jie Deng 2020-09-11 125 break; 0a54ec77196674 Jie Deng 2020-09-11 126 } 0a54ec77196674 Jie Deng 2020-09-11 127 0a54ec77196674 Jie Deng 2020-09-11 128 virtqueue_kick(vq); 0a54ec77196674 Jie Deng 2020-09-11 129 0a54ec77196674 Jie Deng 2020-09-11 130 time_left = wait_for_completion_timeout(&vi->completion, adap->timeout); 0a54ec77196674 Jie Deng 2020-09-11 131 if (!time_left) { 0a54ec77196674 Jie Deng 2020-09-11 132 dev_err(&adap->dev, "msg[%d]: addr=0x%x timeout.\n", i, msgs[i].addr); 0a54ec77196674 Jie Deng 2020-09-11 133 break; 0a54ec77196674 Jie Deng 2020-09-11 134 } 0a54ec77196674 Jie Deng 2020-09-11 135 0a54ec77196674 Jie Deng 2020-09-11 136 vmsg = (struct virtio_i2c_msg *)virtqueue_get_buf(vq, &len); 0a54ec77196674 Jie Deng 2020-09-11 @137 if (vmsg) { ^^^^ Check for NULL. 0a54ec77196674 Jie Deng 2020-09-11 138 /* vmsg should point to the same address with &vi->vmsg */ 0a54ec77196674 Jie Deng 2020-09-11 139 if (vmsg != &vi->vmsg) { 0a54ec77196674 Jie Deng 2020-09-11 140 dev_err(&adap->dev, "msg[%d]: addr=0x%x virtqueue error.\n", 0a54ec77196674 Jie Deng 2020-09-11 141 i, le16_to_cpu(vmsg->hdr.addr)); 0a54ec77196674 Jie Deng 2020-09-11 142 break; 0a54ec77196674 Jie Deng 2020-09-11 143 } 0a54ec77196674 Jie Deng 2020-09-11 144 if (vmsg->status != VIRTIO_I2C_MSG_OK) { 0a54ec77196674 Jie Deng 2020-09-11 145 dev_err(&adap->dev, "msg[%d]: addr=0x%x error=%d.\n", 0a54ec77196674 Jie Deng 2020-09-11 146 i, le16_to_cpu(vmsg->hdr.addr), vmsg->status); 0a54ec77196674 Jie Deng 2020-09-11 147 break; 0a54ec77196674 Jie Deng 2020-09-11 148 } 0a54ec77196674 Jie Deng 2020-09-11 149 if ((msgs[i].flags & I2C_M_RD) && msgs[i].len) 0a54ec77196674 Jie Deng 2020-09-11 150 memcpy(msgs[i].buf, vmsg->buf, msgs[i].len); 0a54ec77196674 Jie Deng 2020-09-11 151 0a54ec77196674 Jie Deng 2020-09-11 152 kfree(vmsg->buf); 0a54ec77196674 Jie Deng 2020-09-11 153 vmsg->buf = NULL; 0a54ec77196674 Jie Deng 2020-09-11 154 } 0a54ec77196674 Jie Deng 2020-09-11 155 0a54ec77196674 Jie Deng 2020-09-11 156 reinit_completion(&vi->completion); 0a54ec77196674 Jie Deng 2020-09-11 157 } 0a54ec77196674 Jie Deng 2020-09-11 158 0a54ec77196674 Jie Deng 2020-09-11 159 mutex_unlock(&vi->i2c_lock); 0a54ec77196674 Jie Deng 2020-09-11 @160 kfree(vmsg->buf); ^^^^^^^^^ Unchecked dereference. 0a54ec77196674 Jie Deng 2020-09-11 161 return ((ret < 0) ? ret : i); 0a54ec77196674 Jie Deng 2020-09-11 162 } --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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