Public bug reported:
In file src/xlibi18n/lcConv.c the following linked list head is defined
static XlcConverterList conv_list = NULL;
Which is then modified by _XlcSetConverter and get_converter in a non
thread-safe manner. Inside get_converter the list is reorderder to
increase the efficiency of looking up the same element the next time,
but this is especially dangerous since a seemingly read-only method is
actually modifying the data.
Modifying the list in such thread unsafe manner does case the list to
become garbled in some workloads and causes infinite loops when the
get_converter is invoked. The solution I suggest is to add a mutex or
spinlock around accesses to the linked list, I would it myself but I'm
not sure about what is the usual mutex implementation for this project.
** Affects: xlibs
Importance: Unknown
Status: Unknown
** Affects: libx11 (Ubuntu)
Importance: Undecided
Status: New
** Bug watch added: freedesktop.org Bugzilla #55678
https://bugs.freedesktop.org/show_bug.cgi?id=55678
** Also affects: xlibs via
https://bugs.freedesktop.org/show_bug.cgi?id=55678
Importance: Unknown
Status: Unknown
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https://bugs.launchpad.net/bugs/1062534
Title:
Type unsafe access to internal linked list
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