[PATCH] iio: gts-helper: Fix memory leaks for i = 1 error path

[Jinjie Ruan]

If i = 1, and per_time_scales[i] or per_time_gains[i] kcalloc fails in
iio_gts_build_avail_scale_table(), the err_free_out will fail to enter
kfree for loop because i-- is 0, and all the per_time_scales[0] and
per_time_gains[0] will not be freed, which will cause memory leaks.

Fix it by checking if i >= 0.

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 38416c28e168 ("iio: light: Add gain-time-scale helpers")
Signed-off-by: Jinjie Ruan <ruanjinjie@xxxxxxxxxx>
---
 drivers/iio/industrialio-gts-helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/industrialio-gts-helper.c b/drivers/iio/industrialio-gts-helper.c
index 7326c7949244..5f131bc1a01e 100644
--- a/drivers/iio/industrialio-gts-helper.c
+++ b/drivers/iio/industrialio-gts-helper.c
@@ -315,7 +315,7 @@ static int iio_gts_build_avail_scale_table(struct iio_gts *gts)
 	return 0;
 
 err_free_out:
-	for (i--; i; i--) {
+	for (i--; i >= 0; i--) {
 		kfree(per_time_scales[i]);
 		kfree(per_time_gains[i]);
 	}
-- 
2.34.1