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jl_calloc overflows #1193

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mkitti opened this issue Oct 20, 2021 · 2 comments
Closed

jl_calloc overflows #1193

mkitti opened this issue Oct 20, 2021 · 2 comments

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@mkitti
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mkitti commented Oct 20, 2021 •
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I notice that Nemo.jl uses jl_calloc. Just be warned that currently the integer multiplication overflows:
JuliaLang/julia#42673

It may return a non-null value and not allocate the memory requested.

julia> ccall(:jl_calloc,Ptr{Nothing},(Csize_t, Csize_t), 0xffffffffffffffff, 0xffffffffffffffff)
Ptr{Nothing} @0x000000001ebd1180
@wbhart
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wbhart commented Nov 3, 2021

Thanks for letting us know.

@mkitti
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mkitti commented Nov 3, 2021

It should be fixed by 1.8:
JuliaLang/julia#42761

@mkitti mkitti closed this as completed Nov 3, 2021
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@wbhart @mkitti