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mei: fix out of array access to me clients array

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The patch 9f81abdac3: "mei: implement mei_cl_connect function"
from Jan 8, 2013, leads to the following static checker warning:
"drivers/misc/mei/main.c:522 mei_ioctl_connect_client()
	 warn: check 'dev->me_clients[]' for negative offsets (-2)"

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler 2013-05-07 21:12:31 +03:00 committed by Greg Kroah-Hartman
parent 221ba15173
commit 46e0cd87d9
1 changed files with 8 additions and 9 deletions
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15
drivers/misc/mei/main.c
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@ -489,10 +489,15 @@ static int mei_ioctl_connect_client(struct file *file,
/* find ME client we're trying to connect to */ /* find ME client we're trying to connect to */
i = mei_me_cl_by_uuid(dev, &data->in_client_uuid); i = mei_me_cl_by_uuid(dev, &data->in_client_uuid);
if (i >= 0 && !dev->me_clients[i].props.fixed_address) { if (i < 0 || dev->me_clients[i].props.fixed_address) {
dev_dbg(&dev->pdev->dev, "Cannot connect to FW Client UUID = %pUl\n",
&data->in_client_uuid);
rets = -ENODEV;
goto end;
}
cl->me_client_id = dev->me_clients[i].client_id; cl->me_client_id = dev->me_clients[i].client_id;
cl->state = MEI_FILE_CONNECTING; cl->state = MEI_FILE_CONNECTING;
}
dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n", dev_dbg(&dev->pdev->dev, "Connect to FW Client ID = %d\n",
cl->me_client_id); cl->me_client_id);
@ -527,11 +532,6 @@ static int mei_ioctl_connect_client(struct file *file,
goto end; goto end;
} }
if (cl->state != MEI_FILE_CONNECTING) {
rets = -ENODEV;
goto end;
}
/* prepare the output buffer */ /* prepare the output buffer */
client = &data->out_client_properties; client = &data->out_client_properties;
@ -543,7 +543,6 @@ static int mei_ioctl_connect_client(struct file *file,
rets = mei_cl_connect(cl, file); rets = mei_cl_connect(cl, file);
end: end:
dev_dbg(&dev->pdev->dev, "free connect cb memory.");
return rets; return rets;
} }