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NFC: pn533: Frame is invalid if ccid.datalen is 0

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Some ACR122 firmwares seem to send 0 length data frames. Before using
that length as a data index, we check that it's not 0. If it is we
report the frame as being invalid.

Reported-by: Arthur Taylor <arthur@advancedtelematic.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Samuel Ortiz 2014-01-04 03:23:35 +01:00
parent a434c24074
commit ea87a5efa9
1 changed files with 3 additions and 0 deletions
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3
drivers/nfc/pn533.c
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@ -521,6 +521,9 @@ static bool pn533_acr122_is_rx_frame_valid(void *_frame, struct pn533 *dev)
if (frame->ccid.type != 0x83)
return false;
if (!frame->ccid.datalen)
return false;
if (frame->data[frame->ccid.datalen - 2] == 0x63)
return false;