[PATCH 5.4 103/168] staging: gasket: Fix incongruency in handling of sysfs entries creation

[Greg Kroah-Hartman]

From: Luis Mendes <luis.p.mendes@xxxxxxxxx>

commit 9195d762042b0e5e4ded63606b4b30a93cba4400 upstream.

Fix incongruency in handling of sysfs entries creation.
This issue could cause invalid memory accesses, by not properly
detecting the end of the sysfs attributes array.

Fixes: 84c45d5f3bf1 ("staging: gasket: Replace macro __ATTR with __ATTR_NULL")
Signed-off-by: Luis Mendes <luis.p.mendes@xxxxxxxxx>
Cc: stable <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200403151534.20753-1-luis.p.mendes@xxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/staging/gasket/gasket_sysfs.c |    3 +--
 drivers/staging/gasket/gasket_sysfs.h |    4 ----
 2 files changed, 1 insertion(+), 6 deletions(-)

--- a/drivers/staging/gasket/gasket_sysfs.c
+++ b/drivers/staging/gasket/gasket_sysfs.c
@@ -228,8 +228,7 @@ int gasket_sysfs_create_entries(struct d
 	}
 
 	mutex_lock(&mapping->mutex);
-	for (i = 0; strcmp(attrs[i].attr.attr.name, GASKET_ARRAY_END_MARKER);
-		i++) {
+	for (i = 0; attrs[i].attr.attr.name != NULL; i++) {
 		if (mapping->attribute_count == GASKET_SYSFS_MAX_NODES) {
 			dev_err(device,
 				"Maximum number of sysfs nodes reached for device\n");
--- a/drivers/staging/gasket/gasket_sysfs.h
+++ b/drivers/staging/gasket/gasket_sysfs.h
@@ -30,10 +30,6 @@
  */
 #define GASKET_SYSFS_MAX_NODES 196
 
-/* End markers for sysfs struct arrays. */
-#define GASKET_ARRAY_END_TOKEN GASKET_RESERVED_ARRAY_END
-#define GASKET_ARRAY_END_MARKER __stringify(GASKET_ARRAY_END_TOKEN)
-
 /*
  * Terminator struct for a gasket_sysfs_attr array. Must be at the end of
  * all gasket_sysfs_attribute arrays.