avoid integer overflow for cache-limit#620
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michaelolbrich wants to merge 1 commit intoicecc:masterfrom
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avoid integer overflow for cache-limit#620michaelolbrich wants to merge 1 commit intoicecc:masterfrom
michaelolbrich wants to merge 1 commit intoicecc:masterfrom
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Jun 21, 2023
Without this, "mb * 1024 * 1024" overflows for mb >= 2048. The result is then cast into size_t, which is unsigned and usually a 64-bit integer. The end result is, that the cache is now basically unlimited. Fix this by making sure that the multiplication operated on 64-bit values.
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"operate_s_" in the commit message.
also, the statement isn't true on 32-bit systems.
hmm. so pedantically, this is all wrong anyway. it shouldn't be size_t, but off64_t or some such. but i suspect that the code is full of such bugs anyway, so whatever. "nobody" still builds on 32-bit machines anyway.
some error handling would be nice, though. but that's a separate thing.
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Without this, "mb * 1024 * 1024" overflows for mb >= 2048. The result is then cast into size_t, which is unsigned and usually a 64-bit integer. The end result is, that the cache is now basically unlimited.
Fix this by making mb a size_t as well to avoid the overflow.