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From c509265c5f6ae7264f7b8a8aae1cfa5fc59d108c Mon Sep 17 00:00:00 2001
From: "K.Kosako" <kosako@sofnec.co.jp>
Date: Thu, 27 Jun 2019 14:11:55 +0900
Subject: [PATCH] Fix CVE-2019-13225: problem in converting if-then-else
pattern to bytecode.
---
src/regcomp.c | 25 +++++++++++++++++--------
1 file changed, 17 insertions(+), 8 deletions(-)
diff --git a/src/regcomp.c b/src/regcomp.c
index c2c04a4..ff3431f 100644
--- a/src/regcomp.c
+++ b/src/regcomp.c
@@ -1307,8 +1307,9 @@ compile_length_bag_node(BagNode* node, regex_t* reg)
len += tlen;
}
+ len += SIZE_OP_JUMP + SIZE_OP_ATOMIC_END;
+
if (IS_NOT_NULL(Else)) {
- len += SIZE_OP_JUMP;
tlen = compile_length_tree(Else, reg);
if (tlen < 0) return tlen;
len += tlen;
@@ -1455,7 +1456,7 @@ compile_bag_node(BagNode* node, regex_t* reg, ScanEnv* env)
case BAG_IF_ELSE:
{
- int cond_len, then_len, jump_len;
+ int cond_len, then_len, else_len, jump_len;
Node* cond = NODE_BAG_BODY(node);
Node* Then = node->te.Then;
Node* Else = node->te.Else;
@@ -1472,8 +1473,7 @@ compile_bag_node(BagNode* node, regex_t* reg, ScanEnv* env)
else
then_len = 0;
- jump_len = cond_len + then_len + SIZE_OP_ATOMIC_END;
- if (IS_NOT_NULL(Else)) jump_len += SIZE_OP_JUMP;
+ jump_len = cond_len + then_len + SIZE_OP_ATOMIC_END + SIZE_OP_JUMP;
r = add_op(reg, OP_PUSH);
if (r != 0) return r;
@@ -1490,11 +1490,20 @@ compile_bag_node(BagNode* node, regex_t* reg, ScanEnv* env)
}
if (IS_NOT_NULL(Else)) {
- int else_len = compile_length_tree(Else, reg);
- r = add_op(reg, OP_JUMP);
- if (r != 0) return r;
- COP(reg)->jump.addr = else_len + SIZE_INC_OP;
+ else_len = compile_length_tree(Else, reg);
+ if (else_len < 0) return else_len;
+ }
+ else
+ else_len = 0;
+ r = add_op(reg, OP_JUMP);
+ if (r != 0) return r;
+ COP(reg)->jump.addr = SIZE_OP_ATOMIC_END + else_len + SIZE_INC_OP;
+
+ r = add_op(reg, OP_ATOMIC_END);
+ if (r != 0) return r;
+
+ if (IS_NOT_NULL(Else)) {
r = compile_tree(Else, reg, env);
}
}
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