Fix heap over-read in cli_get_prompt() for empty cli.prompt - #23415
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iliaal wants to merge 1 commit into
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Fix heap over-read in cli_get_prompt() for empty cli.prompt#23415iliaal wants to merge 1 commit into
iliaal wants to merge 1 commit into
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The prompt parser ran as a do-while, so an empty cli.prompt executed the body on the terminator and scanned past it. Use a while loop and return the interned empty string when nothing was appended. No regression test: extra unicode warnings from the over-read depend on heap contents, so a .phpt cannot pin the bug red-before.
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cli_get_prompt() parsed cli.prompt with a do-while, so the empty string executed the body on the terminator and scanned heap past it. Use a while loop and return the interned empty string when nothing was appended.