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CVS commit: src/sys/arch

Module Name:    src
Committed By:   ozaki-r
Date:           Tue Feb 13 04:10:41 UTC 2018

Modified Files:
        src/sys/arch/amd64/amd64: db_interface.c
        src/sys/arch/i386/i386: db_interface.c

Log Message:
Fix NULL pointer dereference via ddb_regs

ddb_regs can be *ddb_regp (see db_machdep.h) so ddb_regp should be NULL-ed
after dereference to ddb_regs.

Also dbreg should be restored to ddb_regp because ddb_regp can be changed
by db_mach_cpu during db_trap.

Fix PR 52964
Helped by nonaka@

To generate a diff of this commit:
cvs rdiff -u -r1.29 -r1.30 src/sys/arch/amd64/amd64/db_interface.c
cvs rdiff -u -r1.78 -r1.79 src/sys/arch/i386/i386/db_interface.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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