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Merge pull request #699 from JOE1994/0113-marc

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marc: Record::read : Custom `Read` on uninitialized buffer may cause UB
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Sergey "Shnatsel" Davidoff
2021-01-27 17:01:14 +01:00
committed by GitHub
parent 39a88f9c63 8c9978e15d
commit 5f1f4ed3c2
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```toml
[advisory]
id = "RUSTSEC-0000-0000"
package = "marc"
date = "2021-01-26"
url = "https://github.com/blackbeam/rust-marc/issues/7"
categories = ["memory-exposure"]
[versions]
patched = [">= 2.0.0"]
```
# Record::read : Custom `Read` on uninitialized buffer may cause UB
Affected versions of this crate passes an uninitialized buffer to a user-provided `Read` implementation. (`Record::read()`)
Arbitrary `Read` implementations can read from the uninitialized buffer (memory exposure) and also can return incorrect number of bytes written to the buffer.
Reading from uninitialized memory produces undefined values that can quickly invoke undefined behavior.
This flaw was fixed in commit 6299af0 by zero-initializing the newly allocated memory (via `data.resize(len, 0)`) instead of exposing uninitialized memory (`unsafe { data.set_len(len) }`).