Check malloc return value in utmp_db_add#125
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Summary
This PR adds a NULL check after
malloc()inutmp_db_add().Previously, if
malloc()failed, the code would immediately dereferencenew, potentially causing a segmentation fault.new = malloc(sizeof new);
new->idle = idle; / possible NULL dereference */
The function now returns
NULLwhen memory allocation fails, preventing a potential crash.Fixes #124