Red Hat Bugzilla – Bug 499989
Uninitialized bytes during joystick setup
Last modified: 2010-06-28 08:28:42 EDT
Created attachment 343235 [details]
Test case for the bug
Description of problem:
If SDL uses the event interface on Linux for accessing joysticks, the joystick setup might depend on uninitialized bytes.
Version-Release number of selected component (if applicable):
Init a joystick with SDL and trace the application with valgrind. A test case is attached for this.
Steps to Reproduce:
1. Compile the test case with
gcc `sdl-config --libs --cflags` -o SDL-1.2.13.isjoystick.testcase SDL-1.2.13.isjoystick.testcase.c
2. Then execute
valgrind --track-origins=yes ./SDL-1.2.13.isjoystick.testcase
valgrind reports something like
==12393== Conditional jump or move depends on uninitialised value(s)
==12393== at 0x4C76BFF: SDL_SYS_JoystickInit (SDL_sysjoystick.c:387)
==12393== by 0x4C531F9: SDL_JoystickInit (SDL_joystick.c:49)
==12393== by 0x4C2640D: SDL_InitSubSystem (SDL.c:121)
==12393== by 0x4C264AE: SDL_Init (SDL.c:162)
==12393== by 0x4006B4: main (in /home/tdz/rpmbuild/BUILD/SDL-1.2.13.isjoystick.testcase)
==12393== Uninitialised value was created by a stack allocation
==12393== at 0x4C76A4F: SDL_SYS_JoystickInit (SDL_sysjoystick.c:397)
The problem is located in the functions EV_IsJoystick and EV_ConfigJoystick. Some arrays are passed to ioctl and then initialized by the joystick driver. SDL does not fill these arrays with 0 before using them, but depends on the driver to set enough bytes of those arrays to some valid state.
Created attachment 343236 [details]
This bug appears to have been reported against 'rawhide' during the Fedora 11 development cycle.
Changing version to '11'.
More information and reason for this action is here:
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Fedora 11 changed to end-of-life (EOL) status on 2010-06-25. Fedora 11 is
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