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| author | Jeff LaBundy <jeff@labundy.com> | 2022-04-17 16:05:07 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2022-04-17 16:08:58 -0700 |
| commit | 66ab05c75642712f382a17a887eb558caa6646e1 (patch) | |
| tree | a87902e8d682274d0f87c47174858beb8490ca9b /drivers/input | |
| parent | eba697b3c30320933aeb19b0606c2099fe880e51 (diff) | |
| download | linux-66ab05c75642712f382a17a887eb558caa6646e1.tar.bz2 | |
Input: iqs7222 - avoid dereferencing a NULL pointer
Select callers of iqs7222_parse_props() do not expect a child node
to be derived and returned via pointer. As such, these callers set
**child_node to NULL. However, this pointer is dereferenced in all
cases.
To solve this problem, dereference the pointer only for cases that
expect a child node in the first place. In these cases, the caller
provides a valid pointer.
Fixes: e505edaedcb9 ("Input: add support for Azoteq IQS7222A/B/C")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Link: https://lore.kernel.org/r/20220417214132.497487-1-jeff@labundy.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/misc/iqs7222.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/input/misc/iqs7222.c b/drivers/input/misc/iqs7222.c index c0b273222092..6b4138771a3f 100644 --- a/drivers/input/misc/iqs7222.c +++ b/drivers/input/misc/iqs7222.c @@ -1534,8 +1534,8 @@ static int iqs7222_parse_props(struct iqs7222_private *iqs7222, enum iqs7222_reg_key_id reg_key) { u16 *setup = iqs7222_setup(iqs7222, reg_grp, child_index); - struct fwnode_handle *reg_grp_node = *child_node; struct i2c_client *client = iqs7222->client; + struct fwnode_handle *reg_grp_node; char reg_grp_name[16]; int i; @@ -1550,7 +1550,8 @@ static int iqs7222_parse_props(struct iqs7222_private *iqs7222, * for additional group-specific processing. In some cases, the * child node may have already been derived. */ - if (*child_node) + reg_grp_node = *child_node; + if (reg_grp_node) break; snprintf(reg_grp_name, sizeof(reg_grp_name), "%s-%d", |