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authorJohan Hovold <johan@kernel.org>2021-10-27 11:35:29 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-10-30 10:54:47 +0200
commit536de747bc48262225889a533db6650731ab25d3 (patch)
tree3df2148b413d031ca41cbc158920d8165d4c6924 /scripts
parent907767da8f3a925b060c740e0b5c92ea7dbec440 (diff)
comedi: dt9812: fix DMA buffers on stack
USB transfer buffers are typically mapped for DMA and must not be allocated on the stack or transfers will fail. Allocate proper transfer buffers in the various command helpers and return an error on short transfers instead of acting on random stack data. Note that this also fixes a stack info leak on systems where DMA is not used as 32 bytes are always sent to the device regardless of how short the command is. Fixes: 63274cd7d38a ("Staging: comedi: add usb dt9812 driver") Cc: stable@vger.kernel.org # 2.6.29 Reviewed-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20211027093529.30896-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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