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Commit 'fe099c387e06 ("soc: qcom: preserve CPU endianness for QMI_DATA_LEN")' fixed this, but did it by copying a whole word from the source into a local u32 and then operated on that. If the length in the DATA_LEN refers to either a char or short array, it's reasonable to expect that the struct is packed such that this word will contain not only the length-byte (or length-short), but also the beginning of the payload. As the encoder loops around to encode the payload it runs into an unreasonable value of "data_len_value" and bails, with the error message "qmi_encode: Invalid data length". Rather then complicating the logic with local variables of different types we can instead pick the u8 or u16 "data_len_value" directly from "buf_src". As "buf_src" refers to a typical C-structure in the client drivers, we expect this field to be naturally aligned. We can then return to the original expression of qmi_encode_basic_elem() encoding directly from "src_buf" to "dst_buf", with the endianness conversion, based on the size of the type. Reported-by: David Heidelberg Closes: https://lore.kernel.org/all/dfb72933-938f-43f2-87f3-2e3ab9697125@ix= it.cz/ Fixes: fe099c387e06 ("soc: qcom: preserve CPU endianness for QMI_DATA_LEN") Signed-off-by: Bjorn Andersson --- drivers/soc/qcom/qmi_encdec.c | 26 ++++++++++---------------- 1 file changed, 10 insertions(+), 16 deletions(-) diff --git a/drivers/soc/qcom/qmi_encdec.c b/drivers/soc/qcom/qmi_encdec.c index 28ce6f130b6ac355820bb295c8c96f9c6a6e385f..45bb26d010da77ab8d481897026= b718c2290bad7 100644 --- a/drivers/soc/qcom/qmi_encdec.c +++ b/drivers/soc/qcom/qmi_encdec.c @@ -368,8 +368,6 @@ static int qmi_encode(const struct qmi_elem_info *ei_ar= ray, void *out_buf, const void *buf_src; int encode_tlv =3D 0; int rc; - u8 val8; - u16 val16; =20 if (!ei_array) return 0; @@ -406,7 +404,6 @@ static int qmi_encode(const struct qmi_elem_info *ei_ar= ray, void *out_buf, break; =20 case QMI_DATA_LEN: - memcpy(&data_len_value, buf_src, sizeof(u32)); data_len_sz =3D temp_ei->elem_size =3D=3D sizeof(u8) ? sizeof(u8) : sizeof(u16); /* Check to avoid out of range buffer access */ @@ -416,19 +413,16 @@ static int qmi_encode(const struct qmi_elem_info *ei_= array, void *out_buf, __func__); return -ETOOSMALL; } - if (data_len_sz =3D=3D sizeof(u8)) { - val8 =3D data_len_value; - rc =3D qmi_encode_basic_elem(buf_dst, &val8, - 1, data_len_sz); - if (rc < 0) - return rc; - } else { - val16 =3D data_len_value; - rc =3D qmi_encode_basic_elem(buf_dst, &val16, - 1, data_len_sz); - if (rc < 0) - return rc; - } + + if (data_len_sz =3D=3D sizeof(u8)) + data_len_value =3D *(u8 *)buf_src; + else + data_len_value =3D *(u16 *)buf_src; + + rc =3D qmi_encode_basic_elem(buf_dst, buf_src, 1, data_len_sz); + if (rc < 0) + return rc; + UPDATE_ENCODE_VARIABLES(temp_ei, buf_dst, encoded_bytes, tlv_len, encode_tlv, rc); --=20 2.51.0