1 files changed, 30 insertions, 15 deletions

diff --git a/indra/llimage/llimagej2c.cpp b/indra/llimage/llimagej2c.cpp
index 68598589b8..382da40dcf 100644
--- a/indra/llimage/llimagej2c.cpp
+++ b/indra/llimage/llimagej2c.cpp
@@ -107,6 +107,8 @@ bool LLImageJ2C::updateData()
 	bool res = true;
 	resetLastError();
 
+	LLImageDataLock lock(this);
+
 	// Check to make sure that this instance has been initialized with data
 	if (!getData() || (getDataSize() < 16))
 	{
@@ -157,36 +159,48 @@ bool LLImageJ2C::decodeChannels(LLImageRaw *raw_imagep, F32 decode_time, S32 fir
     LL_PROFILE_ZONE_SCOPED_CATEGORY_TEXTURE;
 	LLTimer elapsed;
 
-	bool res = true;
-	
 	resetLastError();
 
-	// Check to make sure that this instance has been initialized with data
-	if (!getData() || (getDataSize() < 16))
+	bool res;
 	{
-		setLastError("LLImageJ2C uninitialized");
-		res = true; // done
-	}
-	else
-	{
-		// Update the raw discard level
-		updateRawDiscardLevel();
+		LLImageDataLock lock(this);
+
 		mDecoding = true;
-		res = mImpl->decodeImpl(*this, *raw_imagep, decode_time, first_channel, max_channel_count);
+		// Check to make sure that this instance has been initialized with data
+		if (!getData() || (getDataSize() < 16))
+		{
+			setLastError("LLImageJ2C uninitialized");
+			res = true; // done
+		}
+		else
+		{
+			// Update the raw discard level
+			updateRawDiscardLevel();
+			res = mImpl->decodeImpl(*this, *raw_imagep, decode_time, first_channel, max_channel_count);
+		}
 	}
-	
+
 	if (res)
 	{
 		if (!mDecoding)
 		{
 			// Failed
 			raw_imagep->deleteData();
+			res = false;
 		}
 		else
 		{
 			mDecoding = false;
 		}
 	}
+	else
+	{
+		if (mDecoding)
+		{
+			LL_WARNS() << "decodeImpl failed but mDecoding is true" << LL_ENDL;
+			mDecoding = false;
+		}
+	}
 
 	if (!mLastError.empty())
 	{
@@ -406,9 +420,10 @@ bool LLImageJ2C::loadAndValidate(const std::string &filename)
 
 bool LLImageJ2C::validate(U8 *data, U32 file_size)
 {
-
 	resetLastError();
-	
+
+	LLImageDataLock lock(this);
+
 	setData(data, file_size);
 
 	bool res = updateData();