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This value is u32 on disk, but assigned to an int in memory. After we do the implicit conversion via assignment, check that the result is at least one[1] (non-negative[2]). 1. The subsequent for-loop iterates from gpt_entries minus one, down, until reaching zero. A negative or zero initial index results in undefined signed integer overflow. 2. It is also used to index into arrays later. In practice, we expected non-malicious disks to contain small positive values. Reported by: Coverity CID: 1223202 Sponsored by: EMC / Isilon Storage Division
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