mtd: nandsim: bugfix: fail if overridesize is too big

If override size is too big, the module was actually loaded instead of
failing, because retval was not set.

This lead to memory corruption with the use of the freed structs nandsim
and nand_chip.

Cc: stable@vger.kernel.org
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index 21e64b5d352b..a932c485eb04 100644
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -2317,6 +2317,7 @@ static int __init ns_init_module(void)
                 uint64_t new_size = (uint64_t)nsmtd->erasesize << overridesize;
                 if (new_size >> overridesize != nsmtd->erasesize) {
                         NS_ERR("overridesize is too big\n");
+                        retval = -EINVAL;
                         goto err_exit;
                 }
                 /* N.B. This relies on nand_scan not doing anything with the size before we change it */