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Deepanshu Kartikey
b61732f473
frame->ccid.datalen is read directly from the USB response frame
and used, unchecked, as an index into frame->data[]. A malicious or
malfunctioning device can set this field to an arbitrary value,
causing the driver to read far outside the received buffer.
Bound ccid.datalen against the maximum possible ACR122 frame size
before using it. This replaces the existing datalen == 0 check,
since datalen < 2 already covers that case and additionally
rejects datalen == 1, which would still underflow the
"datalen - 2" offset used below.
Fixes: 9815c7cf22 ("NFC: pn533: Separate physical layer from the core implementation")
Reported-by: [email protected]
Closes: https://syzkaller.appspot.com/bug?extid=1853daab1a47603d4678
Tested-by: [email protected]
Assisted-by: LLM
Signed-off-by: Deepanshu Kartikey <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: David Heidelberg <[email protected]>