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Remove NULs byte arrays passed to PostProcess (#14587)
PostProcess is supposed to be parsing and handling HTML fragments, but on fuzzing it appears that there is a weird issue with NUL elements that could cause a memory address error in downstream libraries. The simplest solution is to strip out the weird NULs - they should not be there in any case and would be stripped out anyway. Signed-off-by: Andrew Thornton <art27@cantab.net>
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1 changed files with 23 additions and 1 deletions
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@ -324,8 +324,30 @@ func (ctx *postProcessCtx) postProcess(rawHTML []byte) ([]byte, error) {
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// give a generous extra 50 bytes
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res := make([]byte, 0, len(rawHTML)+50)
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// prepend "<html><body>"
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res = append(res, "<html><body>"...)
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res = append(res, rawHTML...)
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// Strip out nuls - they're always invalid
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start := bytes.IndexByte(rawHTML, '\000')
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if start >= 0 {
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res = append(res, rawHTML[:start]...)
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start++
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for start < len(rawHTML) {
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end := bytes.IndexByte(rawHTML[start:], '\000')
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if end < 0 {
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res = append(res, rawHTML[start:]...)
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break
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} else if end > 0 {
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res = append(res, rawHTML[start:start+end]...)
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}
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start += end + 1
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}
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} else {
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res = append(res, rawHTML...)
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}
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// close the tags
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res = append(res, "</body></html>"...)
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// parse the HTML
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