From a1ee6f068e1c8dbc62873645037a353d7852d5cc Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Fri, 31 May 2013 12:33:04 -0600 Subject: dtc: ensure #line directives don't consume data from the next line Previously, the #line parsing regex ended with ({WS}+[0-9]+)?. The {WS} could match line-break characters. If the #line directive did not contain the optional flags field at the end, this could cause any integer data on the next line to be consumed as part of the #line directive parsing. This could cause syntax errors (i.e. #line parsing consuming the leading 0 from a hex literal 0x1234, leaving x1234 to be parsed as cell data, which is a syntax error), or invalid compilation results (i.e. simply consuming literal 1234 as part of the #line processing, thus removing it from the cell data). Fix this by replacing {WS} with [ \t] so that it can't match line-breaks. Convert all instances of {WS}, even though the other instances should be irrelevant for any well-formed #line directive. This is done for consistency and ultimate safety. Reported-by: Ian Campbell Signed-off-by: Stephen Warren Acked-by: David Gibson --- dtc-lexer.l | 2 +- tests/line_directives.dts | 10 ++++++++++ 2 files changed, 11 insertions(+), 1 deletion(-) diff --git a/dtc-lexer.l b/dtc-lexer.l index 254d5af..3b41bfc 100644 --- a/dtc-lexer.l +++ b/dtc-lexer.l @@ -71,7 +71,7 @@ static int pop_input_file(void); push_input_file(name); } -<*>^"#"(line)?{WS}+[0-9]+{WS}+{STRING}({WS}+[0-9]+)? { +<*>^"#"(line)?[ \t]+[0-9]+[ \t]+{STRING}([ \t]+[0-9]+)? { char *line, *tmp, *fn; /* skip text before line # */ line = yytext; diff --git a/tests/line_directives.dts b/tests/line_directives.dts index e9d0800..046ef37 100644 --- a/tests/line_directives.dts +++ b/tests/line_directives.dts @@ -8,4 +8,14 @@ # 6 "bar.dts" / { +/* + * Make sure optional flags don't consume integer data on next line. The issue + * was that the {WS} in the trailing ({WS}+[0-9]+)? could cross the * line- + * break, and consume the leading "0" of the hex constant, leaving "x12345678" + * to be parsed as a number, which is invalid syntax. + */ + prop1 = < +# 10 "qux.dts" + 0x12345678 + >; }; -- cgit v1.2.1