PC-BSD/trueos 682e1b9sys/fs/ext2fs ext2_alloc.c

MFC: r344756, r345179:
Do not read the on-disk inode in case of vnode allocation.

Reported by:    Christopher Krah, Thomas Barabosch, and Jan-Niclas Hilgert of Fraunhofer FKIE
Reported as:    FS-6-EXT2-4: Denial Of Service in mkdir-0 (ext2_mkdir/vn_rdwr)
Reviewed by:    pfg

Differential Revision:    https://reviews.freebsd.org/D19327
DeltaFile
+53-21sys/fs/ext2fs/ext2_alloc.c
+53-211 files

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