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-rw-r--r--netwerk/protocol/http/nsHttpPipeline.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/netwerk/protocol/http/nsHttpPipeline.cpp b/netwerk/protocol/http/nsHttpPipeline.cpp
index 293de8e39..4f5777244 100644
--- a/netwerk/protocol/http/nsHttpPipeline.cpp
+++ b/netwerk/protocol/http/nsHttpPipeline.cpp
@@ -291,6 +291,11 @@ nsHttpPipeline::PushBack(const char *data, uint32_t length)
MOZ_ASSERT(PR_GetCurrentThread() == gSocketThread);
MOZ_ASSERT(mPushBackLen == 0, "push back buffer already has data!");
+ // Some bad behaving proxies may yank the connection out from under us.
+ // Check if we still have a connection to work with.
+ if (!mConnection)
+ return NS_ERROR_FAILURE;
+
// If we have no chance for a pipeline (e.g. due to an Upgrade)
// then push this data down to original connection
if (!mConnection->IsPersistent())