From 64edca1afcc7be54859c9b2b83f7255f1315a18b Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Fri, 8 Jul 2022 16:48:36 +0300 Subject: [PATCH] ASoC: SOF: ipc-msg-injector: fix copy in sof_msg_inject_ipc4_dfs_write() There are two bugs that have to do with when we copy the payload: size = simple_write_to_buffer(ipc4_msg->data_ptr, priv->max_msg_size, ppos, buffer, count); The value of "*ppos" was supposed to be zero but it is sizeof(ipc4_msg->header_u64) so it will copy the data into the middle of the "ipc4_msg->data_ptr" buffer instead of to the start. The second problem is "buffer" should be "buffer + sizeof(ipc4_msg->header_u64)". This function is used for fuzz testing so the data is normally random and this bug likely does not affect anyone very much. In this context, it's simpler and more appropriate to use copy_from_user() instead of simple_write_to_buffer() so I have re-written the function. Fixes: 73bffe328996 ("ASoC: SOF: ipc-msg-injector: Add support for IPC4 messages") Signed-off-by: Dan Carpenter Link: https://lore.kernel.org/r/Ysg1tB2FKLnRMsel@kili Signed-off-by: Mark Brown --- sound/soc/sof/sof-client-ipc-msg-injector.c | 29 +++++++++------------ 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/sound/soc/sof/sof-client-ipc-msg-injector.c b/sound/soc/sof/sof-client-ipc-msg-injector.c index 6bdfa527b7f76..752d5320680f1 100644 --- a/sound/soc/sof/sof-client-ipc-msg-injector.c +++ b/sound/soc/sof/sof-client-ipc-msg-injector.c @@ -181,7 +181,7 @@ static ssize_t sof_msg_inject_ipc4_dfs_write(struct file *file, struct sof_client_dev *cdev = file->private_data; struct sof_msg_inject_priv *priv = cdev->data; struct sof_ipc4_msg *ipc4_msg = priv->tx_buffer; - ssize_t size; + size_t data_size; int ret; if (*ppos) @@ -191,25 +191,20 @@ static ssize_t sof_msg_inject_ipc4_dfs_write(struct file *file, return -EINVAL; /* copy the header first */ - size = simple_write_to_buffer(&ipc4_msg->header_u64, - sizeof(ipc4_msg->header_u64), - ppos, buffer, count); - if (size < 0) - return size; - if (size != sizeof(ipc4_msg->header_u64)) + if (copy_from_user(&ipc4_msg->header_u64, buffer, + sizeof(ipc4_msg->header_u64))) return -EFAULT; - count -= size; + data_size = count - sizeof(ipc4_msg->header_u64); + if (data_size > priv->max_msg_size) + return -EINVAL; + /* Copy the payload */ - size = simple_write_to_buffer(ipc4_msg->data_ptr, - priv->max_msg_size, ppos, buffer, - count); - if (size < 0) - return size; - if (size != count) + if (copy_from_user(ipc4_msg->data_ptr, + buffer + sizeof(ipc4_msg->header_u64), data_size)) return -EFAULT; - ipc4_msg->data_size = count; + ipc4_msg->data_size = data_size; /* Initialize the reply storage */ ipc4_msg = priv->rx_buffer; @@ -221,9 +216,9 @@ static ssize_t sof_msg_inject_ipc4_dfs_write(struct file *file, /* return the error code if test failed */ if (ret < 0) - size = ret; + return ret; - return size; + return count; }; static int sof_msg_inject_dfs_release(struct inode *inode, struct file *file) -- 2.39.5