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authorJim Baxter <jim_baxter@mentor.com>2016-09-08 12:18:16 +0300
committerFelipe Balbi <felipe.balbi@linux.intel.com>2016-09-08 13:53:01 +0300
commit3262ad824307c275922161e82c2db1458822f28c (patch)
tree92e829db6fad476dd9c69301ba5b647fb2f0cd80 /drivers/usb
parent9d6173e125d92e38d4e39bc71f0c3c2cf95cba1a (diff)
downloadlinux-3262ad824307c275922161e82c2db1458822f28c.tar.xz
usb: gadget: f_fs: Stop ffs_closed NULL pointer dereference
The struct ffs_data::private_data has a pointer to ffs_dev stored in it during the ffs_fs_mount() function however it is not cleared when the ffs_dev is freed later which causes the ffs_closed function to crash with "Unable to handle kernel NULL pointer dereference" error when using the data in ffs_data::private_data. This clears this pointer during the ffs_free_dev clean up function. Signed-off-by: Jim Baxter <jim_baxter@mentor.com> Signed-off-by: Jiada Wang <jiada_wang@mentor.com> Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com> Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/function/f_fs.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 998697bd80ac..0aeed85bb5cb 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -3502,6 +3502,11 @@ static void _ffs_free_dev(struct ffs_dev *dev)
list_del(&dev->entry);
if (dev->name_allocated)
kfree(dev->name);
+
+ /* Clear the private_data pointer to stop incorrect dev access */
+ if (dev->ffs_data)
+ dev->ffs_data->private_data = NULL;
+
kfree(dev);
if (list_empty(&ffs_devices))
functionfs_cleanup();