fix wiremessage oob in case of intmin #2076
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prestonvasquez
requested changes
Jun 3, 2025
| @@ -406,7 +406,7 @@ func ReadMsgSectionDocumentSequence(src []byte) (identifier string, docs []bsonc | |||
| // sequence data. | |||
| func ReadMsgSectionRawDocumentSequence(src []byte) (identifier string, data []byte, rem []byte, ok bool) { | |||
| length, rem, ok := readi32(src) | |||
| if !ok || int(length) > len(src) || length-4 < 0 { | |||
| if !ok || int(length) > len(src) || length < 0 || length-4 < 0 { | |||
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Suggest checking length < 4 instead of length < 0 || length-4 < 0 .
We should also add a test for this.
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indeed, seems better
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Couldn't attach GODRIVER task number, 'cause I get 403 forbidden trying to access the project page.
Summary
If
lengthis in range fromINT_MIN(i.e. -2147483648) toINT_MIN+3,length-4 < 0check doesn't work as expected due to integer overflow.Getting too small length leads to check pass and further out of bound access.
Adding an additional check for length being smaller than zero solves the issue.