"out of memory" error when trying to load a PNG with a dubious gAMA chunk

[papandreou]

I had some trouble loading a specific PNG, which other viewers were able to display just fine. The image's onerror handler fires with an "out of memory" error.

However pngcrush does provide a hint about what's wrong:

   Total length of data found in IDAT chunks    =      912
libpng warning: Ignoring gAMA chunk with gamma=0

With that chunk gone, node-canvas is happy again.

I put the original image here: http://gofish.dk/zero-gAMA.png

Of course it's the image that's broken, but I'm reporting it anyway because "out of memory" is a weird symptom :)

[rauchg]

http://libpng.sourceforge.net/decompression_bombs.html

My guess was that Cairo would handle that, but apparently not.

[rauchg]

What libpng version do you have?

(1) Upgrade. Libpng 1.4.0 should be upgraded to version 1.4.1, libpng-1.2.42 to 1.2.43, and libpng-1.0.52 to 1.0.53. 
These all use a new two-pass algorithm for ancillary chunk decompression that 
is about 1000-fold faster than the previous version when decoding a 60 Megabyte iCCP chunk.

[rauchg]

I'm guessing we could potentially implement (2) and/or (3), but my knowledge of PNG is too limited to know if it could have any adverse side effects for otherwise valid PNGs.

[papandreou]

@guille: Thanks for investigating. I'm on libpng 1.2.44 (default on Ubuntu 10.10)

[tj]

GAH github does not notify me of these haha, RAGE

[constantx]

also have the same error when trying to load a local png file, and I'm on libpng 1.4.5

[tj]

I had this a while back as well, I forget how I fixed it haha. I pulled open the source a while back as well and cairo's default error is this memory one, so its most likely not actually a memory issue, bad cairo/pixman versions

[constantx]

just installed a fresh cairo and node-canvas yesterday...

[tj]

could be that the version of libpng might not play nice with pixman. wish I remembered how I fixed it

[jeffv]

Hmmm... I just bumped into a related one too.

Something crapping out on the image load, giving the "Out of Memory" error... even though memory usage looks perfectly normal as far as I can tell. Mine isn't related to a specific image, however.

I haven't pinned it down because it's so intermittent.

[e-zuka]

Had same problem and struggled for hours and finally solved.

My libpng was too latest.
Downgrade to 1.2.xx (actually 1.2.46) and annoying "out of memory" was all gone.

Hope this solve your problem

[jeffv]

Have been running on 1.2.44 and still have "out of memory" errors.