[v9,18/19] zram: do not leak page on writeback_store error path

Commit Message

Sergey Senozhatsky Feb. 27, 2025, 4:35 a.m. UTC

Ensure the page used for local object data is freed
on error out path.

Fixes: 330edc2bc059 (zram: rework writeback target selection strategy)
Signed-off-by: Sergey Senozhatsky <[e-mail]>
---
 drivers/block/zram/zram_drv.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index e8375fcdb36e..5dac525f4cd3 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -787,7 +787,7 @@  static ssize_t writeback_store(struct device *dev,
 	unsigned long index = 0;
 	struct bio bio;
 	struct bio_vec bio_vec;
-	struct page *page;
+	struct page *page = NULL;
 	ssize_t ret = len;
 	int mode, err;
 	unsigned long blk_idx = 0;
@@ -929,8 +929,10 @@  static ssize_t writeback_store(struct device *dev,
 
 	if (blk_idx)
 		free_block_bdev(zram, blk_idx);
-	__free_page(page);
+
 release_init_lock:
+	if (page)
+		__free_page(page);
 	release_pp_ctl(zram, ctl);
 	atomic_set(&zram->pp_in_progress, 0);
 	up_read(&zram->init_lock);