Add workaround for a back reference when no corresponding
parenthesized subexpression is defined. For example, the following command line caused unexpected behavior like segmentation fault: % echo test | sed -e 's/test/\1/' PR: bin/126682 MFC after: 1 week
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=184777
@ -324,9 +324,17 @@ semicolon: EATSPACE();
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if (p == NULL)
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errx(1,
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"%lu: %s: unterminated substitute pattern", linenum, fname);
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/* Compile RE with no case sensitivity temporarily */
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if (*re == '\0')
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cmd->u.s->re = NULL;
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else
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cmd->u.s->re = compile_re(re, 0);
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--p;
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p = compile_subst(p, cmd->u.s);
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p = compile_flags(p, cmd->u.s);
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/* Recompile RE with case sensitivity from "I" flag if any */
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if (*re == '\0')
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cmd->u.s->re = NULL;
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else
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