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| author | Denys Vlasenko <vda.linux@googlemail.com> | 2020-06-09 01:33:54 +0200 |
|---|---|---|
| committer | Denys Vlasenko <vda.linux@googlemail.com> | 2020-06-09 01:33:54 +0200 |
| commit | 6f7a0096496a5a9e90638dc01e947015cc776110 (patch) | |
| tree | 9c069ee55413ec7acef2d1e152859b0f14c9b11f | |
| parent | 45fa3f18adf57ef9d743038743d9c90573aeeb91 (diff) | |
| download | busybox-6f7a0096496a5a9e90638dc01e947015cc776110.tar.gz | |
awk: disallow "str"++, closes bug 12981
function old new delta
parse_expr 887 896 +9
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | editors/awk.c | 4 | ||||
| -rwxr-xr-x | testsuite/awk.tests | 8 |
2 files changed, 11 insertions, 1 deletions
diff --git a/editors/awk.c b/editors/awk.c index 70df2fdb4..f7451ae32 100644 --- a/editors/awk.c +++ b/editors/awk.c @@ -1359,8 +1359,10 @@ static node *parse_expr(uint32_t iexp) v = cn->l.v = xzalloc(sizeof(var)); if (tc & TC_NUMBER) setvar_i(v, t_double); - else + else { setvar_s(v, t_string); + xtc &= ~TC_UOPPOST; /* "str"++ is not allowed */ + } break; case TC_REGEXP: diff --git a/testsuite/awk.tests b/testsuite/awk.tests index b5008290f..87f6b5007 100755 --- a/testsuite/awk.tests +++ b/testsuite/awk.tests @@ -390,5 +390,13 @@ testing 'awk negative field access' \ '' \ 'anything' +# was misinterpreted as (("str"++) i) instead of ("str" (++i)) +# (and was executed: "str"++ is "0", thus concatenating "0" and "1"): +testing 'awk do not allow "str"++' \ + 'awk -v i=1 "BEGIN {print \"str\" ++i}"' \ + "str2\n" \ + '' \ + 'anything' + exit $FAILCOUNT |