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USB: gadget: f_ncm: Fix NDP16 datagram validation 

commit 2b74b0a04d ("USB: gadget: f_ncm: add bounds checks to ncm_unwrap_ntb()")
adds important bounds checking however it unfortunately also introduces  a
bug with respect to section 3.3.1 of the NCM specification.

wDatagramIndex[1] : "Byte index, in little endian, of the second datagram
described by this NDP16. If zero, then this marks the end of the sequence
of datagrams in this NDP16."

wDatagramLength[1]: "Byte length, in little endian, of the second datagram
described by this NDP16. If zero, then this marks the end of the sequence
of datagrams in this NDP16."

wDatagramIndex[1] and wDatagramLength[1] respectively then may be zero but
that does not mean we should throw away the data referenced by
wDatagramIndex[0] and wDatagramLength[0] as is currently the case.

Breaking the loop on (index2 == 0 || dg_len2 == 0) should come at the end
as was previously the case and checks for index2 and dg_len2 should be
removed since zero is valid.

I'm not sure how much testing the above patch received but for me right now
after enumeration ping doesn't work. Reverting the commit restores ping,
scp, etc.

The extra validation associated with wDatagramIndex[0] and
wDatagramLength[0] appears to be valid so, this change removes the incorrect
restriction on wDatagramIndex[1] and wDatagramLength[1] restoring data
processing between host and device.

Fixes: 2b74b0a04d ("USB: gadget: f_ncm: add bounds checks to ncm_unwrap_ntb()")
Cc: Ilja Van Sprundel <ivansprundel@ioactive.com>
Cc: Brooke Basile <brookebasile@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
This commit is contained in:
Bryan O'Donoghue 2020-09-20 18:01:58 +01:00 committed by Felipe Balbi
parent 2eae2dfd58
commit 028296e480
1 changed files with 2 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/usb/gadget/function/f_ncm.c
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@ -1189,7 +1189,6 @@ static int ncm_unwrap_ntb(struct gether *port,
const struct ndp_parser_opts *opts = ncm->parser_opts;
unsigned crc_len = ncm->is_crc ? sizeof(uint32_t) : 0;
int dgram_counter;
bool ndp_after_header;
/* dwSignature */
if (get_unaligned_le32(tmp) != opts->nth_sign) {
@ -1216,7 +1215,6 @@ static int ncm_unwrap_ntb(struct gether *port,
}
ndp_index = get_ncm(&tmp, opts->ndp_index);
ndp_after_header = false;
/* Run through all the NDP's in the NTB */
do {
@ -1232,8 +1230,6 @@ static int ncm_unwrap_ntb(struct gether *port,
ndp_index);
goto err;
}
if (ndp_index == opts->nth_size)
ndp_after_header = true;
/*
* walk through NDP
@ -1312,37 +1308,13 @@ static int ncm_unwrap_ntb(struct gether *port,
index2 = get_ncm(&tmp, opts->dgram_item_len);
dg_len2 = get_ncm(&tmp, opts->dgram_item_len);
if (index2 == 0 || dg_len2 == 0)
break;
/* wDatagramIndex[1] */
if (ndp_after_header) {
if (index2 < opts->nth_size + opts->ndp_size) {
INFO(port->func.config->cdev,
"Bad index: %#X\n", index2);
goto err;
}
} else {
if (index2 < opts->nth_size + opts->dpe_size) {
INFO(port->func.config->cdev,
"Bad index: %#X\n", index2);
goto err;
}
}
if (index2 > block_len - opts->dpe_size) {
INFO(port->func.config->cdev,
"Bad index: %#X\n", index2);
goto err;
}
/* wDatagramLength[1] */
if ((dg_len2 < 14 + crc_len) ||
(dg_len2 > frame_max)) {
INFO(port->func.config->cdev,
"Bad dgram length: %#X\n", dg_len);
goto err;
}
/*
* Copy the data into a new skb.
* This ensures the truesize is correct
@ -1359,6 +1331,8 @@ static int ncm_unwrap_ntb(struct gether *port,
ndp_len -= 2 * (opts->dgram_item_len * 2);
dgram_counter++;
if (index2 == 0 || dg_len2 == 0)
break;
} while (ndp_len > 2 * (opts->dgram_item_len * 2));
} while (ndp_index);