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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-10-13 10:52:16 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-10-13 11:02:20 +0100 |
| commit | 2b194f9db444875b4509e6dc92c949c57437c826 (patch) | |
| tree | eea3cda954998bf4a37d6c56c1f06fcf309f0d62 /sound/soc/soc-core.c | |
| parent | 4abe8e16a8ad879027de3a0a088f281577ad24a9 (diff) | |
| download | lwn-2b194f9db444875b4509e6dc92c949c57437c826.tar.gz lwn-2b194f9db444875b4509e6dc92c949c57437c826.zip | |
ASoC: Check list debugfs files for PAGE_SIZE overflow
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Diffstat (limited to 'sound/soc/soc-core.c')
| -rw-r--r-- | sound/soc/soc-core.c | 49 |
1 files changed, 34 insertions, 15 deletions
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c index 225b5bd2802e..6cee97e23da6 100644 --- a/sound/soc/soc-core.c +++ b/sound/soc/soc-core.c @@ -274,15 +274,22 @@ static ssize_t codec_list_read_file(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); - ssize_t ret = 0; + ssize_t len, ret = 0; struct snd_soc_codec *codec; if (!buf) return -ENOMEM; - list_for_each_entry(codec, &codec_list, list) - ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", - codec->name); + list_for_each_entry(codec, &codec_list, list) { + len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", + codec->name); + if (len >= 0) + ret += len; + if (ret > PAGE_SIZE) { + ret = PAGE_SIZE; + break; + } + } if (ret >= 0) ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); @@ -301,17 +308,23 @@ static ssize_t dai_list_read_file(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); - ssize_t ret = 0; + ssize_t len, ret = 0; struct snd_soc_dai *dai; if (!buf) return -ENOMEM; - list_for_each_entry(dai, &dai_list, list) - ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", dai->name); + list_for_each_entry(dai, &dai_list, list) { + len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", dai->name); + if (len >= 0) + ret += len; + if (ret > PAGE_SIZE) { + ret = PAGE_SIZE; + break; + } + } - if (ret >= 0) - ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); kfree(buf); @@ -328,18 +341,24 @@ static ssize_t platform_list_read_file(struct file *file, size_t count, loff_t *ppos) { char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL); - ssize_t ret = 0; + ssize_t len, ret = 0; struct snd_soc_platform *platform; if (!buf) return -ENOMEM; - list_for_each_entry(platform, &platform_list, list) - ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", - platform->name); + list_for_each_entry(platform, &platform_list, list) { + len = snprintf(buf + ret, PAGE_SIZE - ret, "%s\n", + platform->name); + if (len >= 0) + ret += len; + if (ret > PAGE_SIZE) { + ret = PAGE_SIZE; + break; + } + } - if (ret >= 0) - ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); + ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret); kfree(buf); |