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The null pointer used as second parameter to gdb_put_packet() is passed as second parameter to the memcpy() in line 408 of gdb_put_packet_inner(). In this case memcpy() does not segfault because also the parameter length is zero. Nevertheless, the prototype of memcpy() requires a nonnull pointer. Fixed by passing an empty string in place of the null pointer. Issue highlighted by clang 7.0.0 with warning message: "Null pointer passed as an argument to a 'nonnull' parameter" Change-Id: Ib3dde95d76fcc5fb245ee2d6669e5535d0e0b127 Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com> Reviewed-on: http://openocd.zylin.com/4946 Tested-by: jenkins Reviewed-by: Tomas Vanek <vanekt@fbl.cz>