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Bug #18898
closedIO#set_encoding with invalid arguments leads to a segfault
Status:
Closed
Assignee:
-
Target version:
-
ruby -v:
ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-linux]
Description
Save the following to a file and run it:
#!/usr/bin/env ruby
Encoding.default_external = 'utf-8'
File.open(__FILE__) do |f|
f.set_encoding('utf-8', 'invalid')
printf(
"default external: %p\ndefault internal: %p\nexternal: %p\ninternal: %p\n\n",
Encoding.default_external,
Encoding.default_internal,
f.external_encoding,
f.internal_encoding
)
f.read
end
The above script will result in a segfault at f.read
. This seems to happen because the call to #set_encoding
results in the internal encoding of the IO object being set to follow Encoding.default_external
while also setting the external encoding of the IO object to match. Ovbiously, there shouldn't be a segfault, but I actually expected the IO object's internal encoding to be set to nil due to the invalid encoding being specified for it.
I was able to reproduce this on all versions of Ruby from 2.7.0 to 3.0.2.
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