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authorBrian Foley2016-10-15 14:45:40 +0100
committerDenys Vlasenko2016-10-24 02:09:56 +0200
commit61d5997b586a28f79d54b28ce6963b643dff6e9e (patch)
tree161fb8911ed9a5bda79d1a1f8ac34534aae40564
parent1336052a490ffe7a3790ee3c1366756ca8a7f5ca (diff)
downloadbusybox-61d5997b586a28f79d54b28ce6963b643dff6e9e.zip
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awk: fix segfault on for loop syntax error
Parsing "for()" segfaults as awk fails to find loop iteration expressions. Signed-off-by: Brian Foley <bpfoley@google.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--editors/awk.c2
-rwxr-xr-xtestsuite/awk.tests3
2 files changed, 4 insertions, 1 deletions
diff --git a/editors/awk.c b/editors/awk.c
index d0269b9..685e8be 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -1514,7 +1514,7 @@ static void chain_group(void)
next_token(TC_SEQSTART);
n2 = parse_expr(TC_SEMICOL | TC_SEQTERM);
if (t_tclass & TC_SEQTERM) { /* for-in */
- if ((n2->info & OPCLSMASK) != OC_IN)
+ if (!n2 || (n2->info & OPCLSMASK) != OC_IN)
syntax_error(EMSG_UNEXP_TOKEN);
n = chain_node(OC_WALKINIT | VV);
n->l.n = n2->l.n;
diff --git a/testsuite/awk.tests b/testsuite/awk.tests
index adab4ae..82937bc 100755
--- a/testsuite/awk.tests
+++ b/testsuite/awk.tests
@@ -316,6 +316,9 @@ testing "awk continue" \
"" \
'BEGIN { if (1) continue; else a = 1 }'
+testing "awk handles invalid for loop" \
+ "awk '{ for() }' 2>&1" "awk: cmd. line:1: Unexpected token\n" "" ""
+
# testing "description" "command" "result" "infile" "stdin"
exit $FAILCOUNT