CVE-2025-38481

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> comedi: Fail COMEDI_INSNLIST ioctl if n_insns is too large<br /> <br /> The handling of the `COMEDI_INSNLIST` ioctl allocates a kernel buffer to<br /> hold the array of `struct comedi_insn`, getting the length from the<br /> `n_insns` member of the `struct comedi_insnlist` supplied by the user.<br /> The allocation will fail with a WARNING and a stack dump if it is too<br /> large.<br /> <br /> Avoid that by failing with an `-EINVAL` error if the supplied `n_insns`<br /> value is unreasonable.<br /> <br /> Define the limit on the `n_insns` value in the `MAX_INSNS` macro. Set<br /> this to the same value as `MAX_SAMPLES` (65536), which is the maximum<br /> allowed sum of the values of the member `n` in the array of `struct<br /> comedi_insn`, and sensible comedi instructions will have an `n` of at<br /> least 1.