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When mmap is called, the code in correctly checks for p == MAP_FAILED. But the resource cleanup at the end of busname_peek_message checks for p == NULL, and if that's not true, munmap is called. Therefore in error case, munmap is called with a MAP_FAILED argument which can result in unexpected behaviour depending on sz's value. Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>
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