This is a note to let you know that I've just added the patch titled ASoC: soc-dapm: fix use after free to the 3.17-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: asoc-soc-dapm-fix-use-after-free.patch and it can be found in the queue-3.17 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From e5092c96c9c28f4d12811edcd02ca8eec16e748e Mon Sep 17 00:00:00 2001 From: Daniel Mack <daniel@xxxxxxxxxx> Date: Tue, 7 Oct 2014 13:41:24 +0200 Subject: ASoC: soc-dapm: fix use after free From: Daniel Mack <daniel@xxxxxxxxxx> commit e5092c96c9c28f4d12811edcd02ca8eec16e748e upstream. Coverity spotted the following possible use-after-free condition in dapm_create_or_share_mixmux_kcontrol(): If kcontrol is NULL, and (wname_in_long_name && kcname_in_long_name) validates to true, 'name' will be set to an allocated string, and be freed a few lines later via the 'long_name' alias. 'name', however, is used by dev_err() in case snd_ctl_add() fails. Fix this by adding a jump label that frees 'long_name' at the end of the function. Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- sound/soc/soc-dapm.c | 25 ++++++++++++++----------- 1 file changed, 14 insertions(+), 11 deletions(-) --- a/sound/soc/soc-dapm.c +++ b/sound/soc/soc-dapm.c @@ -591,9 +591,9 @@ static int dapm_create_or_share_mixmux_k int shared; struct snd_kcontrol *kcontrol; bool wname_in_long_name, kcname_in_long_name; - char *long_name; + char *long_name = NULL; const char *name; - int ret; + int ret = 0; prefix = soc_dapm_prefix(dapm); if (prefix) @@ -652,15 +652,17 @@ static int dapm_create_or_share_mixmux_k kcontrol = snd_soc_cnew(&w->kcontrol_news[kci], NULL, name, prefix); - kfree(long_name); - if (!kcontrol) - return -ENOMEM; + if (!kcontrol) { + ret = -ENOMEM; + goto exit_free; + } + kcontrol->private_free = dapm_kcontrol_free; ret = dapm_kcontrol_data_alloc(w, kcontrol); if (ret) { snd_ctl_free_one(kcontrol); - return ret; + goto exit_free; } ret = snd_ctl_add(card, kcontrol); @@ -668,17 +670,18 @@ static int dapm_create_or_share_mixmux_k dev_err(dapm->dev, "ASoC: failed to add widget %s dapm kcontrol %s: %d\n", w->name, name, ret); - return ret; + goto exit_free; } } ret = dapm_kcontrol_add_widget(kcontrol, w); - if (ret) - return ret; + if (ret == 0) + w->kcontrols[kci] = kcontrol; - w->kcontrols[kci] = kcontrol; +exit_free: + kfree(long_name); - return 0; + return ret; } /* create new dapm mixer control */ Patches currently in stable-queue which might be from daniel@xxxxxxxxxx are queue-3.17/asoc-soc-pcm-fix-sig_bits-determination-in-soc_pcm_apply_msb.patch queue-3.17/asoc-soc-dapm-fix-use-after-free.patch queue-3.17/asoc-core-fix-use-after-free-in-snd_soc_remove_platform.patch -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html