f41ced8f10
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> |
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| .. | ||
| oss | ||
| seq | ||
| Kconfig | ||
| Makefile | ||
| control.c | ||
| control_compat.c | ||
| device.c | ||
| hrtimer.c | ||
| hwdep.c | ||
| hwdep_compat.c | ||
| info.c | ||
| info_oss.c | ||
| init.c | ||
| isadma.c | ||
| jack.c | ||
| memalloc.c | ||
| memory.c | ||
| misc.c | ||
| pcm.c | ||
| pcm_compat.c | ||
| pcm_lib.c | ||
| pcm_memory.c | ||
| pcm_misc.c | ||
| pcm_native.c | ||
| pcm_timer.c | ||
| rawmidi.c | ||
| rawmidi_compat.c | ||
| rtctimer.c | ||
| sgbuf.c | ||
| sound.c | ||
| sound_oss.c | ||
| timer.c | ||
| timer_compat.c | ||
| vmaster.c | ||