[PATCH] mtd/redboot: avoid null pointer deref

Wed, 21 Dec 2016 15:27:24 -0800 

By giving a bogus partition name, it's possible to trigger a null
pointer dereference.

Signed-off-by: Jason A. Donenfeld <[email protected]>
---
 drivers/mtd/redboot.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/redboot.c b/drivers/mtd/redboot.c
index 7623ac5fc586..53949ef80d36 100644
--- a/drivers/mtd/redboot.c
+++ b/drivers/mtd/redboot.c
@@ -212,6 +212,10 @@ static int parse_redboot_partitions(struct mtd_info 
*master,
 
                nrparts++;
        }
+       if (!fl) {
+               ret = -EINVAL;
+               goto out;
+       }
 #ifdef CONFIG_MTD_REDBOOT_PARTS_UNALLOCATED
        if (fl->img->flash_base) {
                nrparts++;
-- 
2.11.0

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