From 4449fac89875a8fffeaab00edad0e759db81a329 Mon Sep 17 00:00:00 2001 From: Philipp Zabel Date: Wed, 19 Mar 2014 14:25:02 +0100 Subject: mtd: ubi: avoid NULL pointer dereference in ubi_get_device If the ubidetach command is given a number that passes the range check in ubi_detach_mtd_dev, but at which index the ubi_devices array contains a NULL pointer, ubi_get_device tries to dereference this NULL pointer to increment the ubi device reference count. Signed-off-by: Philipp Zabel Signed-off-by: Sascha Hauer --- drivers/mtd/ubi/build.c | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers') diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c index da21f69e7e..b908fcda0b 100644 --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -104,6 +104,8 @@ struct ubi_device *ubi_get_device(int ubi_num) struct ubi_device *ubi; ubi = ubi_devices[ubi_num]; + if (!ubi) + return NULL; ubi->ref_count++; -- cgit v1.2.3