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ash: parser: Do not push token back before parseheredoc

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    Date: Mon, 19 Nov 2018 18:43:58 +0800
    parser: Do not push token back before parseheredoc

    When we read the first token in list() we use peektoken instead
    of readtoken as the following code needs to use the same token
    again.  However, this is wrong when we're in a here-document as
    it will clobber the saved token without resetting the tokpushback
    flag.

    This patch fixes it by doing the tokpushback after parseheredoc
    and setting lasttoken again if parseheredoc was called.

    Reported-by: Ron Yorston <rmy@frippery.org>
    Fixes: 7c245aa8ed33 ("[PARSER] Simplify EOF/newline handling in...")
    Fixes: ee5cbe9fd6bc ("[SHELL] Optimize dash -c "command" to avoid a fork")
    Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
    Tested-by: Simon Ser <contact@emersion.fr>

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2020-02-22 17:26:23 +01:00
parent 9a1a659707
commit c08993f40c
1 changed files with 4 additions and 1 deletions
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5
shell/ash.c
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@ -11607,7 +11607,7 @@ list(int nlflag)
n1 = NULL;
for (;;) {
switch (peektoken()) {
switch (readtoken()) {
case TNL:
if (!(nlflag & 1))
break;
@ -11618,9 +11618,12 @@ list(int nlflag)
if (!n1 && (nlflag & 1))
n1 = NODE_EOF;
parseheredoc();
tokpushback++;
lasttoken = TEOF;
return n1;
}
tokpushback++;
checkkwd = CHKNL | CHKKWD | CHKALIAS;
if (nlflag == 2 && ((1 << peektoken()) & tokendlist))
return n1;