Mark Wielaard 547abdee69 Fix crash in sys_modify_ldt wrapper on bad ptr. Bug #369383. ...

Make sure ptr is safe_to_deref if not NULL.
Also fixup some corner case error return codes.
We have to do that ourselves since we never actually call into the kernel.

Found by LTP testcases/kernel/syscalls/modify_ldt/modify_ldt01.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@15995

2016-10-01 11:54:50 +00:00

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