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Commit 0518f8cb authored by Daniel Rosenberg's avatar Daniel Rosenberg
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snapuserd: Fix PrepareReadAhead 

When checking the instead of current, and when checking the position, we could underflow,
which would get caught by UBSAN

Bug: 177104308
Test: Map cow file with xor op or copy op at position 0
Change-Id: I4fba1982419e08b58759ec893e238175d245dbfc
parent bb0a7642
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