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Bug 165243 - crash from missing check for invalid multibyte strings when setting $IFS
crash from missing check for invalid multibyte strings when setting $IFS
Product: Fedora
Classification: Fedora
Component: bash (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Tim Waugh
Ben Levenson
Depends On:
  Show dependency treegraph
Reported: 2005-08-05 15:32 EDT by Elliot Lee
Modified: 2007-12-11 05:50 EST (History)
0 users

See Also:
Fixed In Version: 3.0-33
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
: 539536 (view as bug list)
Last Closed: 2005-08-08 11:09:18 EDT
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Regression: ---
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Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
Test case (22 bytes, text/plain)
2005-08-05 15:34 EDT, Elliot Lee
no flags Details

  None (edit)
Description Elliot Lee 2005-08-05 15:32:31 EDT
Line 6954 of subst.c, in the setifs function:

  if (!ifs_value)
      ifs_firstc[0] = '\0';
      ifs_firstc_len = 1;
      size_t ifs_len = strnlen (ifs_value, MB_CUR_MAX);
      ifs_firstc_len = mblen (ifs_value, ifs_len);
      memcpy (ifs_firstc, ifs_value, ifs_firstc_len);

If the ifs_value string is not a valid multibyte string, mblen may return -1.
The subsequent memcpy causes a crash.

I'm not sure what the right outcome is, but crashing is not it :)
Comment 1 Elliot Lee 2005-08-05 15:34:31 EDT
Created attachment 117500 [details]
Test case

The test case and bug info courtesy of Derek Pomery <>
Comment 3 Tim Waugh 2005-08-08 11:09:18 EDT
Should be fixed in bash-3.0-33.  Thanks for the report.

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