accel/qaic: tighten bounds checking in decode_message()

Browse source

commit 51b56382ed upstream.

Copy the bounds checking from encode_message() to decode_message().

This patch addresses the following concerns.  Ensure that there is
enough space for at least one header so that we don't have a negative
size later.

	if (msg_hdr_len < sizeof(*trans_hdr))

Ensure that we have enough space to read the next header from the
msg->data.

	if (msg_len > msg_hdr_len - sizeof(*trans_hdr))
		return -EINVAL;

Check that the trans_hdr->len is not below the minimum size:

	if (hdr_len < sizeof(*trans_hdr))

This minimum check ensures that we don't corrupt memory in
decode_passthrough() when we do.

	memcpy(out_trans->data, in_trans->data, len - sizeof(in_trans->hdr));

And finally, use size_add() to prevent an integer overflow:

	if (size_add(msg_len, hdr_len) > msg_hdr_len)

Fixes: 129776ac2e ("accel/qaic: Add control path")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Pranjal Ramajor Asha Kanojiya <quic_pkanojiy@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Cc: stable@vger.kernel.org # 6.4.x
Signed-off-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ZK0Q5nbLyDO7kJa+@moroto
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Dan Carpenter 2023-07-11 11:20:54 +03:00 • committed by Greg Kroah-Hartman

parent 1072bace37

commit 57d14cb3ba

1 changed files with 10 additions and 2 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

12

drivers/accel/qaic/qaic_control.c

View file