Geert Uytterhoeven 7ddfdb5c5a ASoC: simple-card: Fix crash in asoc_simple_card_unref() ... If asoc_simple_card_probe() fails, asoc_simple_card_unref() may be called before dev_set_drvdata(), causing a NULL pointer dereference in asoc_simple_card_unref(): Unable to handle kernel NULL pointer dereference at virtual address 000000d4 ... PC is at asoc_simple_card_unref+0x14/0x48 LR is at asoc_simple_card_probe+0x3d4/0x40c This typically happens because asoc_simple_card_parse_of() returns -EPROBE_DEFER, but other failure modes are possible. devm_snd_soc_register_card()/snd_soc_register_card() may fail either before or after dev_set_drvdata(). Pass a snd_soc_card pointer instead of a platform_device pointer to asoc_simple_card_unref() to fix this. Note that if CONFIG_OF_DYNAMIC=n, of_node_put() is a dummy, and gcc may optimize away the loop over card->dai_link, never actually dereferencing card, and thus avoiding the crash... Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Fixes: e512e001da ("ASoC: simple-card: Fix the reference count of device nodes") Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org		2015-01-14 17:16:37 +00:00
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simple-card.c	ASoC: simple-card: Fix crash in asoc_simple_card_unref()	2015-01-14 17:16:37 +00:00