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author | Ian Abbott <abbotti@mev.co.uk> | 2019-04-15 12:52:30 +0100 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-04-27 09:30:30 +0200 |
commit | 911176ad4df2a523102aa8dd156716e4342f2560 (patch) | |
tree | 4eb4f9b9c469fa558c7dceb9ada6e9ac9f8008be | |
parent | afb7cd602189da55dce400cb44d8bd42044e6894 (diff) | |
download | linux-stable-911176ad4df2a523102aa8dd156716e4342f2560.tar.gz linux-stable-911176ad4df2a523102aa8dd156716e4342f2560.tar.bz2 linux-stable-911176ad4df2a523102aa8dd156716e4342f2560.zip |
staging: comedi: vmk80xx: Fix possible double-free of ->usb_rx_buf
commit 663d294b4768bfd89e529e069bffa544a830b5bf upstream.
`vmk80xx_alloc_usb_buffers()` is called from `vmk80xx_auto_attach()` to
allocate RX and TX buffers for USB transfers. It allocates
`devpriv->usb_rx_buf` followed by `devpriv->usb_tx_buf`. If the
allocation of `devpriv->usb_tx_buf` fails, it frees
`devpriv->usb_rx_buf`, leaving the pointer set dangling, and returns an
error. Later, `vmk80xx_detach()` will be called from the core comedi
module code to clean up. `vmk80xx_detach()` also frees both
`devpriv->usb_rx_buf` and `devpriv->usb_tx_buf`, but
`devpriv->usb_rx_buf` may have already been freed, leading to a
double-free error. Fix it by removing the call to
`kfree(devpriv->usb_rx_buf)` from `vmk80xx_alloc_usb_buffers()`, relying
on `vmk80xx_detach()` to free the memory.
Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | drivers/staging/comedi/drivers/vmk80xx.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/staging/comedi/drivers/vmk80xx.c b/drivers/staging/comedi/drivers/vmk80xx.c index e14f637e59ad..6c743bbf520a 100644 --- a/drivers/staging/comedi/drivers/vmk80xx.c +++ b/drivers/staging/comedi/drivers/vmk80xx.c @@ -757,10 +757,8 @@ static int vmk80xx_alloc_usb_buffers(struct comedi_device *dev) size = le16_to_cpu(devpriv->ep_tx->wMaxPacketSize); devpriv->usb_tx_buf = kzalloc(size, GFP_KERNEL); - if (!devpriv->usb_tx_buf) { - kfree(devpriv->usb_rx_buf); + if (!devpriv->usb_tx_buf) return -ENOMEM; - } return 0; } |