bug(dd): when count= is a very large number it panics

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
76/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Quiet
Tech stack
rust
Domain
cli

Research direction

Start with src/uu/dd/src/dd.rs:1425 and reproduce the panic using dd if=a of=b count=177817277272177278. Trace the overflowing multiplication and verify that handling this very large count no longer panics.

Written by the indexing model from the issue text.

Description

U - dd

Hi, uutils mainteners

we confirmed dd panics when count= is a very large number

relunsec@relunsec:~/software/coreutils/target/debug$ ./dd if=a of=b count=177817277272177278

thread 'main' (107552) panicked at src/uu/dd/src/dd.rs:1425:42:
attempt to multiply with overflow
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
relunsec@relunsec:~/software/coreutils/target/debug$
Dominant language
Rust
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Merged PRs (30d)
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