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

commit bb0a13a13411c4ce24c48c8ff3cdf7b48d237240 upstream.

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.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
index c606b6a..b9cbd65 100644 (file)
--- a/drivers/mtd/nand/nandsim.c
+++ b/drivers/mtd/nand/nandsim.c
@@ -2355,6 +2355,7 @@ 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 */