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authorJulia Lawall <julia@diku.dk>2009-10-17 08:33:47 +0200
committerTakashi Iwai <tiwai@suse.de>2009-10-30 12:01:38 +0100
commite8e0929d7290cab7c5b1a3e5f5f54f73daf38038 (patch)
tree164f1377ab4210212b61ce65fa5b16a0cf82b765 /Documentation/mips
parent4b3be6afa4ab8b3fdce39df68bad71f8b85164de (diff)
ALSA: sound/parisc: Move dereference after NULL test
If the NULL test on h is needed in snd_harmony_mixer_init, then the dereference should be after the NULL test. Actually, there is a sequence of calls: snd_harmony_create, then snd_harmony_pcm_init, and then snd_harmony_mixer_init. snd_harmony_create initializes h, but may indeed leave it as NULL. There was no NULL test at the beginning of snd_harmony_pcm_init, so I have added one. The NULL test in snd_harmony_mixer_init is then not necessary, but in case the ordering of the calls changes, I have left it, and moved the dereference after it. A simplified version of the semantic match that detects this problem is as follows (http://coccinelle.lip6.fr/): // <smpl> @match exists@ expression x, E; identifier fld; @@ * x->fld ... when != \(x = E\|&x\) * x == NULL // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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