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Subject[PATCH 4/8] nvmem: core: Fix cell lookup when no cell is found
Date
If the cell list is not empty and nvmem_find_cell_by_node/name() is
called for a cell that is not present in the list they will return an
invalid pointer instead of NULL. This happen because
list_for_each_entry() stop once it reach the list head again, but as
the list head is not contained in a struct nvmem_cell the iteration
variable then contains an invalid value.

This is easily solved by using a variable to iterate over the list and
one to return the cell found.

Signed-off-by: Alban Bedel <albeu@free.fr>
---
drivers/nvmem/core.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 8e1b52559467..a7556b20cff4 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -525,12 +525,14 @@ static int nvmem_add_cells_from_table(struct nvmem_device *nvmem)
static struct nvmem_cell *
nvmem_find_cell_by_name(struct nvmem_device *nvmem, const char *cell_id)
{
- struct nvmem_cell *cell = NULL;
+ struct nvmem_cell *iter, *cell = NULL;

mutex_lock(&nvmem_mutex);
- list_for_each_entry(cell, &nvmem->cells, node) {
- if (strcmp(cell_id, cell->name) == 0)
+ list_for_each_entry(iter, &nvmem->cells, node) {
+ if (strcmp(cell_id, iter->name) == 0) {
+ cell = iter;
break;
+ }
}
mutex_unlock(&nvmem_mutex);

@@ -994,12 +996,14 @@ nvmem_cell_get_from_lookup(struct device *dev, const char *con_id)
static struct nvmem_cell *
nvmem_find_cell_by_node(struct nvmem_device *nvmem, struct device_node *np)
{
- struct nvmem_cell *cell = NULL;
+ struct nvmem_cell *iter, *cell = NULL;

mutex_lock(&nvmem_mutex);
- list_for_each_entry(cell, &nvmem->cells, node) {
- if (np == cell->np)
+ list_for_each_entry(iter, &nvmem->cells, node) {
+ if (np == iter->np) {
+ cell = iter;
break;
+ }
}
mutex_unlock(&nvmem_mutex);

--
2.19.1
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