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When parsing target attributes, if an invalid architecture string is provided, the function parse_single_ext may return nullptr. The existing code does not check for this case, leading to a nullptr dereference when attempting to access the returned pointer. This patch adds a check to ensure that the returned pointer is not nullptr before dereferencing it. If it is nullptr, an appropriate error message is generated. gcc/ChangeLog: * config/riscv/riscv-target-attr.cc (riscv_target_attr_parser::parse_arch): Fix nullptr dereference when parsing invalid arch string. gcc/testsuite/ChangeLog: * gcc.target/riscv/target-attr-bad-11.c: New test.
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