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mei: mei_cl_link protect open_handle_count from overflow 

mei_cl_link is called both from mei_open and also from
in-kernel drivers so we need to protect open_handle_count
from overflow

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 2013-09-02 03:11:00 +03:00 committed by Greg Kroah-Hartman
parent 4a10c2ac2f
commit caaeb09afd
1 changed files with 6 additions and 0 deletions
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6
drivers/misc/mei/client.c
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@ -287,6 +287,12 @@ int mei_cl_link(struct mei_cl *cl, int id)
return -ENOENT; return -ENOENT;
} }
if (dev->open_handle_count >= MEI_MAX_OPEN_HANDLE_COUNT) {
dev_err(&dev->pdev->dev, "open_handle_count exceded %d",
MEI_MAX_OPEN_HANDLE_COUNT);
return -ENOENT;
}
dev->open_handle_count++; dev->open_handle_count++;
cl->host_client_id = id; cl->host_client_id = id;