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soc: qcom: qmi_encdec: Restrict string length in decode

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The QMI TLV value for strings in a lot of qmi element info structures
account for null terminated strings with MAX_LEN + 1. If a string is
actually MAX_LEN + 1 length, this will cause an out of bounds access
when the NULL character is appended in decoding.

Fixes: 9b8a11e826 ("soc: qcom: Introduce QMI encoder/decoder")
Cc: stable@vger.kernel.org
Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Signed-off-by: Praveenkumar I <quic_ipkumar@quicinc.com>
Link: https://lore.kernel.org/r/20230801064712.3590128-1-quic_ipkumar@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Chris Lew 2023-08-01 12:17:12 +05:30 committed by Bjorn Andersson
parent 5f908786cf
commit 8d207400fd
1 changed files with 2 additions and 2 deletions
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4
drivers/soc/qcom/qmi_encdec.c
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@ -534,8 +534,8 @@ static int qmi_decode_string_elem(const struct qmi_elem_info *ei_array,
decoded_bytes += rc;
}
if (string_len > temp_ei->elem_len) {
pr_err("%s: String len %d > Max Len %d\n",
if (string_len >= temp_ei->elem_len) {
pr_err("%s: String len %d >= Max Len %d\n",
__func__, string_len, temp_ei->elem_len);
return -ETOOSMALL;
} else if (string_len > tlv_len) {