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2626820d83
ftrace_module_init() and do_init_module() that the allocations made in ftrace_module_init() will not be freed, resulting in a memory leak. The solution is to call ftrace_release_mod() on the failing module in the fail path befor do_init_module() is called. This will remove any allocations made for that module, and nothing if ftrace_module_init() wasn't called yet for that module. Note, once do_init_module() is called, the MODULE_GOING notifiers are called for the failed module, which calls into the ftrace code to do the proper clean up (basically calling ftrace_release_mod()). -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAABAgAGBQJWjqzAAAoJEKKk/i67LK/8WgIH/3OTlOqrr527nodzj5glLgyn GJRyQcI2VNq1m63KjWRO1QtH0OPIB/kFEyBVruNb3FEU3jQHgUNOk5whDkiOdcbp yXBXkTkhyNOSAUxm95drUkEQiwDScfU6FjUy2dQjdyi4+86sYKRP+FIdL6B1Q5vk M2w2JRVe2HU5RnONf63AUPcRRA+PbUqGk3S9i+HwOfCMqVEEoayRVmxibTnlEsba YCf6d1ppzimd4c2FcyCnoyFGkfDUZWDQw2RFdWaEtOTKTzFz25hMebw4omwMQ9pt gdbve/sY2e9BI4yHIew+tmDDWqfT8ejpXhn/eOzWd074HD7hzxU7xfd2UXZRD7w= =x94j -----END PGP SIGNATURE----- Merge tag 'trace-v4.4-rc4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull ftrace fix from Steven Rostedt: "PeiyangX Qiu reported that if a module fails to load between calling ftrace_module_init() and do_init_module() that the allocations made in ftrace_module_init() will not be freed, resulting in a memory leak. The solution is to call ftrace_release_mod() on the failing module in the fail path befor do_init_module() is called. This will remove any allocations made for that module, and nothing if ftrace_module_init() wasn't called yet for that module. Note, once do_init_module() is called, the MODULE_GOING notifiers are called for the failed module, which calls into the ftrace code to do the proper clean up (basically calling ftrace_release_mod())" * tag 'trace-v4.4-rc4-4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: ftrace/module: Call clean up function when module init fails early |
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