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staging: most: core: check value returned by match function 

This patch adds a check for the pointer returned by the function
match_component. It is needed to prevent a NULL pointer dereference in
case the provided component name does not match any list entry.

Signed-off-by: Christian Gromm <christian.gromm@microchip.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Christian Gromm 2017-11-21 15:05:17 +01:00 committed by Greg Kroah-Hartman
parent 4e6d561d51
commit 3ba5515bf4
1 changed files with 4 additions and 0 deletions
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4
drivers/staging/most/core.c
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@ -711,6 +711,8 @@ static ssize_t add_link_store(struct device_driver *drv,
if (ret)
return ret;
comp = match_component(comp_name);
if (!comp)
return -ENODEV;
if (!comp_param || *comp_param == 0) {
snprintf(devnod_buf, sizeof(devnod_buf), "%s-%s", mdev,
mdev_ch);
@ -754,6 +756,8 @@ static ssize_t remove_link_store(struct device_driver *drv,
if (ret)
return ret;
comp = match_component(comp_name);
if (!comp)
return -ENODEV;
c = get_channel(mdev, mdev_ch);
if (!c)
return -ENODEV;