USB: cxacru: potential underflow in cxacru_cm_get_array()
The value of "offd" comes off the instance->rcv_buf[] and we used it as the offset into an array. The problem is that we check the upper bound but not for negative values. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -686,7 +686,8 @@ static int cxacru_cm_get_array(struct cxacru_data *instance, enum cxacru_cm_requ
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{
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int ret, len;
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__le32 *buf;
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int offb, offd;
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int offb;
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unsigned int offd;
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const int stride = CMD_PACKET_SIZE / (4 * 2) - 1;
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int buflen = ((size - 1) / stride + 1 + size * 2) * 4;
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