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Crash when passing empty string to loadFont function #1140

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fireclawthefox opened this issue Apr 7, 2021 · 1 comment
Closed

Crash when passing empty string to loadFont function #1140

fireclawthefox opened this issue Apr 7, 2021 · 1 comment
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bug
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1.10.10

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@fireclawthefox
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Description

Passing an empty string to the loader.loadFont function results in an out of memory crash.

Steps to Reproduce

from direct.showbase.ShowBase import ShowBase
ShowBase()
loader.loadFont("")

Environment

  • Panda3D version: 1.10.9
  • Installation method: pip
  • Python version: 3.9
rdb added a commit that referenced this issue Apr 8, 2021
@rdb
pnmtext: Fix loading an invalid font resulting in a crash
4a7d03d 
Related to #1140
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rdb commented Apr 8, 2021

This appears to be a bug in Linux or perhaps the filesystem driver. What's happening is that it tries to load "path/to/current/directory/" + "" (ie. the directory it's in), and then tries to seek to the end to determine the size, but lseek is returning the odd value of 0x7fffffffffffffff.

@rdb rdb added this to the 1.10.10 milestone Apr 8, 2021
@rdb rdb added the bug label Apr 8, 2021
@rdb rdb closed this as completed in addbc8a Apr 8, 2021
rdb added a commit that referenced this issue Apr 9, 2021
@rdb
dtoolutil/express: Resolving empty filename should yield no result
e9e1bb1 
See #1140 - I may revert this if someone can demonstrate a compelling use case (for current directory, you can use "." instead), but it seems to have the potential to cause unintuitive behavior.
lachbr pushed a commit to lachbr/panda3d that referenced this issue Jun 16, 2023
@rdb
dtoolutil: Work around odd Linux bug with lseek on a directory fd
adbbc13 
Fixes panda3d#1140
lachbr pushed a commit to lachbr/panda3d that referenced this issue Jun 16, 2023
@rdb
dtoolutil/express: Resolving empty filename should yield no result
0617e40 
See panda3d#1140 - I may revert this if someone can demonstrate a compelling use case (for current directory, you can use "." instead), but it seems to have the potential to cause unintuitive behavior.
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