This bug affects the Origin games downloader in Wine, rendering a great
swath of games unplayable.
** Changed in: libx11 (Ubuntu)
Status: New => Confirmed
** Summary changed:
- Type unsafe access to internal linked list
+ Type unsafe access to internal linked list, breaks Origin games in Wine
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https://bugs.launchpad.net/bugs/1062534
Title:
Type unsafe access to internal linked list, breaks Origin games in
Wine
Status in Modular X11 Libraries:
Confirmed
Status in “libx11” package in Ubuntu:
Confirmed
Bug description:
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.
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