diag: Null pointer check to avoid kernel panic
When accessing diag master table we need a check for
null pointer while iterating over the circular list.
Without this check there is a possibility of kernel panic.
CRs-Fixed: 1087738
Change-Id: I73ee708f2df6e1cd6b56fc40296ede490824f194
Signed-off-by: Gopikrishna Mogasati <gmogas@codeaurora.org>
diff --git a/drivers/char/diag/diagchar_core.c b/drivers/char/diag/diagchar_core.c
index ac777b0..c44a9ea 100644
--- a/drivers/char/diag/diagchar_core.c
+++ b/drivers/char/diag/diagchar_core.c
@@ -701,6 +701,11 @@
list_for_each_safe(start, temp, &driver->cmd_reg_list) {
item = list_entry(start, struct diag_cmd_reg_t, link);
+ if (item == NULL || &item->entry == NULL) {
+ pr_err("diag: In %s, unable to search command\n",
+ __func__);
+ return NULL;
+ }
temp_entry = &item->entry;
if (temp_entry->cmd_code == entry->cmd_code &&
temp_entry->subsys_id == entry->subsys_id &&