Integer signedness error in the fwioctl (FWIOCTL) function in the FireWire (IEEE-1394) drivers (dev/firewire/fwdev.c) in various BSD kernels, including DragonFlyBSD, FreeBSD 5.5, MidnightBSD 0.1-CURRENT before 20061115, NetBSD-current before 20061116, NetBSD-4 before 20061203, and TrustedBSD, allows local users to read arbitrary memory contents via certain negative values of crombuf->len in an FWGCROM command. NOTE: this issue has been labeled as an integer overflow, but it is more like an integer signedness error.