powerpc/kprobes: refactor kprobe_lookup_name for safer string operations
Use safer string manipulation functions when dealing with a user-provided string in kprobe_lookup_name(). Reported-by: NDavid Laight <David.Laight@ACULAB.COM> Signed-off-by: NNaveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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