genirq: Fix chained interrupt data ordering

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commit 2c4569ca26 upstream.

irq_set_chained_handler_and_data() sets up the chained interrupt and then
stores the handler data.

That's racy against an immediate interrupt which gets handled before the
store of the handler data happened. The handler will dereference a NULL
pointer and crash.

Cure it by storing handler data before installing the chained handler.

Reported-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Thomas Gleixner 2017-05-11 13:54:11 +02:00 • committed by Greg Kroah-Hartman

parent 3fe116563d

commit 423f1752a0

1 changed files with 1 additions and 1 deletions

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kernel/irq/chip.c

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