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At the beginning move_later is set to -1, but it is set to different
value only if expression !move_later is true.
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udev_device_get_subsystem() may return NULL if no subsystem could be
figured out by libudev. This might be due to OOM or if the device
disconnected between the udev_device_new() call and
udev_device_get_subsystem(). Therefore, we need to handle subsystem==NULL
safely.
Instead of testing for it in each helper, we treat subsystem==NULL as
empty subsystem in match_subsystem().
Backtrace of udev_enumerate with an input-device disconnecting in exactly
this time-frame:
(gdb) bt
#0 0x00007ffff569dc24 in strnlen () from /usr/lib/libc.so.6
#1 0x00007ffff56d9e04 in fnmatch@@GLIBC_2.2.5 () from /usr/lib/libc.so.6
#2 0x00007ffff5beb83d in match_subsystem (udev_enumerate=0x7a05f0, subsystem=0x0) at src/libudev/libudev-enumerate.c:727
#3 0x00007ffff5bebb30 in parent_add_child (enumerate=enumerate@entry=0x7a05f0, path=<optimized out>) at src/libudev/libudev-enumerate.c:834
#4 0x00007ffff5bebc3f in parent_crawl_children (enumerate=enumerate@entry=0x7a05f0, path=0x7a56b0 "/sys/devices/<shortened>/input/input97", maxdepth=maxdepth@entry=254) at src/libudev/libudev-enumerate.c:866
#5 0x00007ffff5bebc54 in parent_crawl_children (enumerate=enumerate@entry=0x7a05f0, path=0x79e8c0 "/sys/devices/<shortened>/input", maxdepth=maxdepth@entry=255) at src/libudev/libudev-enumerate.c:868
#6 0x00007ffff5bebc54 in parent_crawl_children (enumerate=enumerate@entry=0x7a05f0, path=path@entry=0x753190 "/sys/devices/<shortened>", maxdepth=maxdepth@entry=256) at src/libudev/libudev-enumerate.c:868
#7 0x00007ffff5bec7df in scan_devices_children (enumerate=0x7a05f0) at src/libudev/libudev-enumerate.c:882
#8 udev_enumerate_scan_devices (udev_enumerate=udev_enumerate@entry=0x7a05f0) at src/libudev/libudev-enumerate.c:919
#9 0x00007ffff5df8777 in <random_caller> () at some/file.c:181
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We need to free udev-devices again if they don't match. Funny that no-one
noticed it yet since valgrind is quite verbose about it.
Fix it and free non-matching devices.
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If a realloc() happens in syspath_add(), the move_later pointer could
point to an invalid memory region.
Let move_later store the array index, instead of the pointer to the
entry.
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This commit imports strxcpyx from upstream. This is upstream commit
d5a89d7dc17a5ba5cf4fc71f82963c5c94a31c3d
Note: there were also some very minor code cleanups to
accelerometer.c: line 187
collect.c: lines 35, 140
libudev-device.c: line 780
libudev-hwdb.c: line 300
These are part of upstream commits:
507f22bd0172bff5e5d98145b1419bd472a2c57f
3cf7b686e6b29f78de0af5929602cae4482f6d49
67410e9f73a6cdd8453c78b966451b5151def14a
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
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https://bugs.freedesktop.org/show_bug.cgi?id=58289
systemd commit e68893075083a7461b1572233d23fdb23541d630
Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
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