fix crash when using skipdata with NULL mnemonic #1703
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When setting up skipdata with the mnemonic as
NULL, capstone will crash during disassembly here when trying to strcpy a null pointer:https://github.com/aquynh/capstone/blob/c93fa3a79614a0de48dcb0b9dd98156bd6326bee/cs.c#L945-L946
This can be verified by changing
cs_opt_skipdataintest_skipdata.c.This fix will use the
SKIPDATA_MNEMconstant whenNULLis passed, so it will work according to the documentation:https://github.com/aquynh/capstone/blob/c93fa3a79614a0de48dcb0b9dd98156bd6326bee/include/capstone/capstone.h#L255-L260