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-rw-r--r--editors/awk.c3
-rwxr-xr-xtestsuite/awk.tests6
2 files changed, 9 insertions, 0 deletions
diff --git a/editors/awk.c b/editors/awk.c
index d54249b..bafc9ba 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -598,6 +598,7 @@ static const char EMSG_NOT_ARRAY[] ALIGN1 = "Not an array";
static const char EMSG_POSSIBLE_ERROR[] ALIGN1 = "Possible syntax error";
static const char EMSG_UNDEF_FUNC[] ALIGN1 = "Call to undefined function";
static const char EMSG_NO_MATH[] ALIGN1 = "Math support is not compiled in";
+static const char EMSG_NEGATIVE_FIELD[] ALIGN1 = "Access to negative field";
static void zero_out_var(var *vp)
{
@@ -2949,6 +2950,8 @@ static var *evaluate(node *op, var *res)
case XC( OC_FIELD ): {
int i = (int)getvar_i(R.v);
+ if (i < 0)
+ syntax_error(EMSG_NEGATIVE_FIELD);
if (i == 0) {
res = intvar[F0];
} else {
diff --git a/testsuite/awk.tests b/testsuite/awk.tests
index ad0583a..3933fef 100755
--- a/testsuite/awk.tests
+++ b/testsuite/awk.tests
@@ -339,5 +339,11 @@ testing "awk handles invalid for loop" \
"awk '{ for() }' 2>&1" "awk: cmd. line:1: Unexpected token\n" "" ""
# testing "description" "command" "result" "infile" "stdin"
+testing 'awk negative field access' \
+ 'awk 2>&1 -- '\''{ $(-1) }'\' \
+ "awk: cmd. line:1: Access to negative field\n" \
+ '' \
+ 'anything'
+
exit $FAILCOUNT