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drivers: media: broadcast: Fix security vulnerability issue

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Information leak issue is reported in mpq_sdmx_log_level_write
function. Added check to validate count is not zero and initialize
the string.

Change-Id: Ieb2ed88c2d7d778c56be2ec3b9875270a9c74dce
Signed-off-by: Udaya Bhaskara Reddy Mallavarapu <udaym@codeaurora.org>
This commit is contained in:
Udaya Bhaskara Reddy Mallavarapu 2017-09-05 12:01:41 +05:30
parent d727a95d2e
commit bbacde467c
1 changed files with 6 additions and 2 deletions
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8
drivers/media/platform/msm/dvb/demux/mpq_dmx_plugin_common.c
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@ -523,13 +523,17 @@ static ssize_t mpq_sdmx_log_level_write(struct file *fp,
int level;
struct mpq_demux *mpq_demux = fp->private_data;
if (count >= 16)
if (count == 0 || count >= 16)
return -EINVAL;
ret_count = simple_write_to_buffer(user_str, 16, position, user_buffer,
memset(user_str, '\0', sizeof(user_str));
ret_count = simple_write_to_buffer(user_str, 15, position, user_buffer,
count);
if (ret_count < 0)
return ret_count;
else if (ret_count == 0)
return -EINVAL;
ret = kstrtoint(user_str, 0, &level);
if (ret)