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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2019-05-22 14:33:58 +0300 |
|---|---|---|
| committer | Paul Gortmaker <paul.gortmaker@windriver.com> | 2019-09-16 12:21:34 -0400 |
| commit | da6d4c7650a24c56c631b844787020eaa0ef9f90 (patch) | |
| tree | 726da1acbe3d2ba6eecef3f55c31d4d4ef9ea124 | |
| parent | 73940f2a969da142af11c1ed90fafa6ef61fe491 (diff) | |
| download | linux-yocto-da6d4c7650a24c56c631b844787020eaa0ef9f90.tar.gz linux-yocto-da6d4c7650a24c56c631b844787020eaa0ef9f90.tar.bz2 linux-yocto-da6d4c7650a24c56c631b844787020eaa0ef9f90.zip | |
usb: xhci: Fix a potential null pointer dereference in xhci_debugfs_create_endpoint()
commit 5bce256f0b528624a34fe907db385133bb7be33e upstream.
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>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
| -rw-r--r-- | drivers/usb/host/xhci-debugfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-debugfs.c b/drivers/usb/host/xhci-debugfs.c index cadc01336bf8..7ba6afc7ef23 100644 --- a/drivers/usb/host/xhci-debugfs.c +++ b/drivers/usb/host/xhci-debugfs.c @@ -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; |