Exception in reading exif from a PNG file

[tomaszg7]

Describe the bug

Geeqie was crashing on a particular file I had on my disk (BestImageViewer/geeqie#1181). It turns out current version of exiv2 (i.e. 0.28) was throwing exception. Before there was no problem, but I didn't downgrade the library to check.

To Reproduce

Steps to reproduce the behavior:

1. download the file from here: http://www.normankoren.com/Tutorials/Lenstarg_25_7086p_15g_25is.png
2. run exiv2 Lenstarg_25_7086p_15g_25is.png
3. Uncaught exception: Overflow in Exiv2::DataBuf::c_data

Desktop (please complete the following information):

• OS and version: Gentoo
• Exiv2 version and source: exiv2-0.28.0 built locally
• Compiler and version: gcc (Gentoo 12.3.1_p20230526 p2) 12.3.1 20230526
• Compilation mode and/or compiler flags: nothing fancy, -O2 -march=native -pipe

Additional context

exiftool produces normal output:

ExifTool Version Number         : 12.64
File Name                       : Lenstarg_25_7086p_15g_25is.png
Directory                       : .
File Size                       : 201 kB
File Modification Date/Time     : 2017:08:16 18:22:37+02:00
File Access Date/Time           : 2023:08:30 11:52:08+02:00
File Inode Change Date/Time     : 2023:08:30 11:52:08+02:00
File Permissions                : -rw-r--r--
File Type                       : PNG
File Type Extension             : png
MIME Type                       : image/png
Image Width                     : 7086
Image Height                    : 2168
Bit Depth                       : 8
Color Type                      : Palette
Compression                     : Deflate/Inflate
Filter                          : Adaptive
Interlace                       : Noninterlaced
Palette                         : (Binary data 768 bytes, use -b option to extract)
Pixels Per Unit X               : 2835
Pixels Per Unit Y               : 2835
Pixel Units                     : meters
Modify Date                     : 2003:04:19 16:57:09
Author                          : 
Description                     : Target length = 2.5mm;  7086 pixels;  gamma = 1.5
Copyright                       : 
Creation Time                   : 
Software                        : 
Disclaimer                      : 
PNG Warning                     : 
Source                          : 
Comment                         : 
Title                           : 
Image Size                      : 7086x2168
Megapixels                      : 15.4

[kmilos]

Can't reproduce w/ current 0.28.x branch tip.

$ ./exiv2 Lenstarg_25_7086p_15g_25is.png
File name       : Lenstarg_25_7086p_15g_25is.png
File size       : 200554 Bytes
MIME type       : image/png
Image size      : 7086 x 2168
Lenstarg_25_7086p_15g_25is.png: No Exif data found in the file

Duplicate of #2650

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