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allocator_avl: return 0 for improper size_at call

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In case the given address is not the start of a block bail instead of
making improper size assumptions.

Issue #4325.
This commit is contained in:
Josef Söntgen 2021-11-12 16:29:42 +01:00 committed by Christian Helmuth
parent 49bf58a2ae
commit 98385a7658
1 changed files with 3 additions and 0 deletions
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3
repos/base/src/lib/base/allocator_avl.cc
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@ -401,6 +401,9 @@ size_t Allocator_avl_base::size_at(void const *addr) const
/* lookup corresponding block */
Block *b = _find_by_address(reinterpret_cast<addr_t>(addr));
if (b && (b->addr() != (addr_t)addr))
return 0;
return (b && b->used()) ? b->size() : 0;
}