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usb: xhci: Fix a potential null pointer dereference in xhci_debugfs_create_endpoint() 

In xhci_debugfs_create_slot(), kzalloc() can fail and
dev->debugfs_private will be NULL.
In xhci_debugfs_create_endpoint(), dev->debugfs_private is used without
any null-pointer check, and can cause a null pointer dereference.

To fix this bug, a null-pointer check is added in
xhci_debugfs_create_endpoint().

This bug is found by a runtime fuzzing tool named FIZZER written by us.

[subjet line change change, add potential -Mathais]
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jia-Ju Bai 2019-05-22 14:33:58 +03:00 committed by Greg Kroah-Hartman
parent 597c56e372
commit 5bce256f0b
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/host/xhci-debugfs.c
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@ -440,6 +440,9 @@ void xhci_debugfs_create_endpoint(struct xhci_hcd *xhci,
struct xhci_ep_priv *epriv;
struct xhci_slot_priv *spriv = dev->debugfs_private;
if (!spriv)
return;
if (spriv->eps[ep_index])
return;