Laurent Pinchart f41ced8f10 Check fops_get() return value ... Several subsystem open handlers dereference the fops_get() return value without checking it for nullness. This opens a race condition between the open handler and module unloading. A module can be marked as being unloaded (MODULE_STATE_GOING) before its exit function is called and gets the chance to unregister the driver. During that window open handlers can still be called, and fops_get() will fail in try_module_get() and return a NULL pointer. This change checks the fops_get() return value and returns -ENODEV if NULL. Reported-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk> Signed-off-by: Laurent Pinchart <laurent.pinchart@skynet.be> Acked-by: Takashi Iwai <tiwai@suse.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Dave Airlie <airlied@linux.ie> Acked-by: Mauro Carvalho Chehab <mchehab@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-01-06 15:59:11 -08:00
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accessibility	…
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atm	…
auxdisplay	…
base	…
block	…
bluetooth	…
cdrom	…
char	mm: make vread() and vwrite() declaration	2009-01-06 15:59:05 -08:00
clocksource	…
connector	…
cpufreq	…
cpuidle	…
crypto	…
dca	…
dio	…
dma	…
edac	…
eisa	…
firewire	…
firmware	…
gpio	…
gpu	Check fops_get() return value	2009-01-06 15:59:11 -08:00
hid	…
hwmon	…
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ide	…
idle	…
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infiniband	…
input	…
isdn	…
leds	…
lguest	…
macintosh	…
mca	…
md	…
media	Check fops_get() return value	2009-01-06 15:59:11 -08:00
memstick	…
message	…
mfd	…
misc	pci: use pci_ioremap_bar() in drivers/misc	2009-01-06 15:59:10 -08:00
mmc	…
mtd	…
net	…
nubus	…
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oprofile	…
parisc	…
parport	…
pci	…
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power	…
ps3	…
rapidio	…
regulator	…
rtc	…
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serial	…
sh	…
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staging	…
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w1	…
watchdog	…
xen	…
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Kconfig	…
Makefile	…