[PATCH] mtd: nand: Prevent dereference of NULL pointer

[Andrew Goodbody]

In nand_wait_ready there is a loop that includes a NULL check for
chip->dev_ready before it is dereferenced. Use a NULL check once the
loop is exited as well to cover the case where it exits due to a timeout
and it is therefore not known if chip->dev_ready is NULL or not.

This issue found by Smatch.

Signed-off-by: Andrew Goodbody <andrew.goodbody at linaro.org>
---
 drivers/mtd/nand/raw/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index d3d1b93947b..48e3685d995 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -566,7 +566,7 @@ void nand_wait_ready(struct mtd_info *mtd)
 				break;
 	}
 
-	if (!chip->dev_ready(mtd))
+	if (!chip->dev_ready || !chip->dev_ready(mtd))
 		pr_warn("timeout while waiting for chip to become ready\n");
 }
 EXPORT_SYMBOL_GPL(nand_wait_ready);

---
base-commit: 7027b445cc0bfb86204ecb1f1fe596f5895048d9
change-id: 20250701-mtd_nand_fixes-191e5a19932d

Best regards,
-- 
Andrew Goodbody <andrew.goodbody at linaro.org>