cgroups: check the returned value of opendir - #414
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We have an unusual case when a cgroup controller directory grants other users with execute (x) permission but without read (r) permission. As a result, when running atop as a user who is not the owner of the directory, we succeed in the chdir but fail on opendir. Therefore, opendir returns NULL and leads to a crash. This commit checks the returned value of opendir and returns error when the value is NULL to avoid the crash.
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We have an unusual case when a cgroup controller directory grants other users with execute (x) permission but without read (r) permission. As a result, when running atop as a user who is not the owner of the directory, we succeed in the chdir but fail on opendir. Therefore, opendir returns NULL and leads to a crash. This commit checks the returned value of opendir and returns error when the value is NULL to avoid the crash.