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authorRob Landley <rob@landley.net>2014-12-15 03:34:55 -0600
committerRob Landley <rob@landley.net>2014-12-15 03:34:55 -0600
commita1ea6bb8ea8143cc18fa00703e58819929501654 (patch)
treeb188aa86e6016af475a8ce80bcdc2c0a780bb415 /tests/expr.test
parent807a50d89976e2de081d487a54e8e109d49f0a6d (diff)
downloadtoybox-a1ea6bb8ea8143cc18fa00703e58819929501654.tar.gz
Fix yet another sed bug.
The s/// command would copy the \ of substitutions before deciding what to do with them (generally overwriting the \ with the new data). When the substitution was A) at the very end of the new string, B) resolved to nothing, it could leave a trailing \ that didn't belong there and didn't get overwritten because the "copy trailing data" part that copies the original string's null terminator already happened before the \ overwrote it. The ghostwheel() function restarts regexes after embedded NUL bytes, but if the string it's passed is _longer_ than the length it's told then it gets confused (and it means we're off the end of our allocation so segfaults are likely). Fix: test for \ first and move the "copy byte" logic into an else case.
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