Improvements on rbtree_best_fit::check_sanity - #282
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Perform quick tests before iterating on the blocks. Early exit from loop if block size is 0 or accumulated free memory exceeds maximum. Signed-off-by: Miguel Company <miguelcompany@eprosima.com>
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When checking the sanity of a shared memory segment, if the memory has been corrupted, the iterator might read outside the segment, producing a segfault.
This was found during the investigation of eProsima/Fast-DDS#6501
The proposed changes perform the quick check on the header before the loop.
Inside the loop, the check for the alignment is performed before accessing the data pointed to by the iterator, and the loop returns early whenever the accumulated
free_memoryvalue exceeds the limit.This reduces the chance of the iterator jumping to an offset outside the segment.