CVE-2026-72482gpib: fix double decrement of descriptor_busy in command_ioctl()

Official description

In the Linux kernel, the following vulnerability has been resolved: gpib: fix double decrement of descriptor_busy in command_ioctl() commit d1857f8296dc ("gpib: fix use-after-free in IO ioctl handlers") introduced a descriptor_busy reference counter to pin struct gpib_descriptor across IO ioctl operations. In command_ioctl(), the error path inside the loop decrements descriptor_busy and breaks, but execution then falls through to the unconditional decrement after the loop, underflowing the counter to -1. This re-enables the use-after-free that the original fix was meant to prevent: a concurrent close_dev_ioctl() sees descriptor_busy == 0 on an actively-used descriptor and frees it. Remove the early decrement from the error path. The post-loop decrement already handles all exit paths, matching the correct pattern used in read_ioctl() and write_ioctl().

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/fdee9f207a48ce204ec6cfceaa1459d2473600a5
• https://git.kernel.org/stable/c/8b5f1d295dda8677e4545ce340053fcfa8b634c7
• https://git.kernel.org/stable/c/c4faab452b3c1ada003d49c477609dd80523b9bf