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preproc: Don't access out of bound data on malformed input

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There are a number of places still where we test text
data which is potentially may be an empty string. This
is known to happen on fuzzer input but usually doesn't
take place in regular valid programs. Surely we need
to revisit preprocessor code for this kind of errors.

https://bugzilla.nasm.us/show_bug.cgi?id=3392525

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Cyrill Gorcunov 2018-10-29 22:54:08 +03:00
parent b756372b06
commit 4b5b737d49
1 changed files with 3 additions and 2 deletions
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5
asm/preproc.c
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@ -2271,8 +2271,9 @@ static int do_directive(Token *tline, char **output)
skip_white_(tline);
if (!tline || !tok_type_(tline, TOK_PREPROC_ID) ||
(tline->text[1] == '%' || tline->text[1] == '$'
|| tline->text[1] == '!'))
(tline->text[0] && (tline->text[1] == '%' ||
tline->text[1] == '$' ||
tline->text[1] == '!')))
return NO_DIRECTIVE_FOUND;
i = pp_token_hash(tline->text);