1225679 - IE11 and Chrome display some corrupt PNGs that Firefox doesn't

Status: NEW

(Core :: Graphics: ImageLib, defect)

Description

[stefano2998]

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; Trident/7.0; .NET CLR 2.0.50727; SLCC2; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; Tablet PC 2.0; .NET4.0E; rv:11.0) like Gecko

Steps to reproduce:

ff 38.4 esr Website check:  
http://www.schaik.com/pngsuite/pngsuite_xxx_png.html  and
http://www.schaik.com/pngsuite/pngsuite_xxx_gif.html




Actual results:

ff38.4 esr: 
None corrupt png showed,
all corrupt gif showed
ie11: 
2 of 14 showed
xhdn0g08 - incorrect IHDR checksum  showed,
xcsn0g01 - incorrect IDAT checksum  showed,
all corrupt gif showed


Expected results:

same Level as IE11 or more:
2 of 14 showed or more
xhdn0g08 - incorrect IHDR checksum  showed,
xcsn0g01 - incorrect IDAT checksum  showed,

all corrupt gif showed: done

Comment 1

[Gingerbread Man]

Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0
20151117030242

http://www.schaik.com/pngsuite/xcsn0g01.png
Also shows in Opera 33.

―――――

Confirming since other browsers display the images. Since the files are genuinely corrupt, I expect this is Invalid or Wontfix.
The only bonafide bug I noticed is that the “The image <url goes here> cannot be displayed because it contains errors.” message fails to consistently show up; sometimes just the image URL shows instead.

Comment 2

[Mason Chang [Inactive] [:mchang]]

Also expecting that we won't fix this. Seth, do we have a policy on corrupt images?

Comment 3

[Glenn Randers-Pehrson]

We could turn off the CRC validation.  There would be a slight increase in decoding speed, and it would be a huge benefit to fuzzers because they wouldn't have to generate a valid CRC for each PNG chunk variation.  I don't recommend doing that.

Comment 4

[Jonathan Watt [:jwatt]]

Mass bug change to replace various 'parity' whiteboard flags with the new canonical keywords. (See bug 1443764 comment 13.)

Comment 5

[Chris Peterson [:cpeterson]]

Test results for http://www.schaik.com/pngsuite/pngsuite_xxx_png.html in 2020:

Chrome (80.0.3987.122) renders the following corrupt PNGs:
xcsn0g01 - incorrect IDAT checksum

IE (11.1.19041.0) still renders the following corrupt PNGs:
xhdn0g08 - incorrect IHDR checksum
xcsn0g01 - incorrect IDAT checksum

Firefox (75 Nightly) still renders none of the corrupt PNGs.