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usb: gadget: rndis: check size of RNDIS_MSG_SET command

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Check the size of the RNDIS_MSG_SET command given to us before
attempting to respond to an invalid message size.

Reported-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Cc: stable@kernel.org
Tested-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2022-02-09 16:37:53 +01:00
parent 75e5b4849b
commit 38ea1eac7d
1 changed files with 6 additions and 3 deletions
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9
drivers/usb/gadget/function/rndis.c
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@ -637,14 +637,17 @@ static int rndis_set_response(struct rndis_params *params,
rndis_set_cmplt_type *resp; rndis_set_cmplt_type *resp;
rndis_resp_t *r; rndis_resp_t *r;
BufLength = le32_to_cpu(buf->InformationBufferLength);
BufOffset = le32_to_cpu(buf->InformationBufferOffset);
if ((BufLength > RNDIS_MAX_TOTAL_SIZE) ||
(BufOffset + 8 >= RNDIS_MAX_TOTAL_SIZE))
return -EINVAL;
r = rndis_add_response(params, sizeof(rndis_set_cmplt_type)); r = rndis_add_response(params, sizeof(rndis_set_cmplt_type));
if (!r) if (!r)
return -ENOMEM; return -ENOMEM;
resp = (rndis_set_cmplt_type *)r->buf; resp = (rndis_set_cmplt_type *)r->buf;
BufLength = le32_to_cpu(buf->InformationBufferLength);
BufOffset = le32_to_cpu(buf->InformationBufferOffset);
#ifdef VERBOSE_DEBUG #ifdef VERBOSE_DEBUG
pr_debug("%s: Length: %d\n", __func__, BufLength); pr_debug("%s: Length: %d\n", __func__, BufLength);
pr_debug("%s: Offset: %d\n", __func__, BufOffset); pr_debug("%s: Offset: %d\n", __func__, BufOffset);