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39 lines
1.6 KiB
39 lines
1.6 KiB
3 years ago
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From 738785214546ec5bb772886019529b2a6519deaf Mon Sep 17 00:00:00 2001
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From: Simon McVittie <smcv@debian.org>
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Date: Fri, 1 May 2020 19:04:22 +0100
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Subject: [PATCH] mozjs: Avoid use-after-free
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If we don't assign the temporary std::string returned by
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url_.to_string() to a variable, then it immediately goes out of scope
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and is freed, resulting in the result of c_str() pointing into freed
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memory. This works about as well as you would expect.
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Signed-off-by: Simon McVittie <smcv@debian.org>
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---
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libproxy/modules/pacrunner_mozjs.cpp | 11 ++++-------
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1 file changed, 4 insertions(+), 7 deletions(-)
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diff --git a/libproxy/modules/pacrunner_mozjs.cpp b/libproxy/modules/pacrunner_mozjs.cpp
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index ade6d0a..aac6531 100644
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--- a/libproxy/modules/pacrunner_mozjs.cpp
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+++ b/libproxy/modules/pacrunner_mozjs.cpp
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@@ -175,14 +175,11 @@ class mozjs_pacrunner : public pacrunner {
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string run(const url& url_) throw (bad_alloc) {
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// Build arguments to the FindProxyForURL() function
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- const char *tmpurl = url_.to_string().c_str();
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- const char *tmphost = url_.get_host().c_str();
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- if (!tmpurl || !tmphost) {
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- throw bad_alloc();
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- }
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+ string tmpurl(url_.to_string());
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+ string tmphost(url_.get_host());
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JS::AutoValueArray<2> args(this->jsctx);
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- args[0].setString(JS_NewStringCopyZ(this->jsctx, tmpurl));
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- args[1].setString(JS_NewStringCopyZ(this->jsctx, tmphost));
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+ args[0].setString(JS_NewStringCopyZ(this->jsctx, tmpurl.c_str()));
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+ args[1].setString(JS_NewStringCopyZ(this->jsctx, tmphost.c_str()));
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// Find the proxy (call FindProxyForURL())
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JS::RootedValue rval(this->jsctx);
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