HSD# 16027100077-3: mtd: spi-nor: core: Check for null pointer to avoid soft error

Ensure that the pointer passed to module_put() in spi_nor_put_device()
is not NULL before use. In certain configurations, the pointer may be
uninitialized or NULL, which can lead to a null pointer dereference
and a soft kernel error.

This change adds a guard clause to return early, preventing the error
and maintaining system stability without requiring a reboot.

Signed-off-by: Khairul Anuar Romli <[email protected]>

Author: kromli

drivers/mtd/spi-nor/core.c

@@ -3250,7 +3250,8 @@ static void spi_nor_put_device(struct mtd_info *mtd)
 	else
 		dev = nor->dev;
 
-	module_put(dev->driver->owner);
+	if (dev && dev->driver && dev->driver->owner)
+		module_put(dev->driver->owner);
 }
 
 static void spi_nor_restore(struct spi_nor *nor)