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Commit d8ae6c00 authored by Arjun Shankar's avatar Arjun Shankar Committed by Dmitry V. Levin
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iconv: Accept redundant shift sequences in IBM1364 [BZ #26224]



The IBM1364, IBM1371, IBM1388, IBM1390 and IBM1399 character sets
share converter logic (iconvdata/ibm1364.c) which would reject
redundant shift sequences when processing input in these character
sets.  This led to a hang in the iconv program (CVE-2020-27618).

This commit adjusts the converter to ignore redundant shift sequences
and adds test cases for iconv_prog hangs that would be triggered upon
their rejection.  This brings the implementation in line with other
converters that also ignore redundant shift sequences (e.g. IBM930
etc., fixed in commit 692de4b3).

Reviewed-by: default avatarCarlos O'Donell <carlos@redhat.com>
(cherry picked from commit 9a99c682)
parent 670c675d
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