[PATCH 5.4 250/367] soc: qcom: qmi_encdec: Restrict string length in decode

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5.4-stable review patch.  If anyone has any objections, please let me know.


From: Chris Lew <quic_clew@xxxxxxxxxxx>

commit 8d207400fd6b79c92aeb2f33bb79f62dff904ea2 upstream.

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: 9b8a11e82615 ("soc: qcom: Introduce QMI encoder/decoder")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Chris Lew <quic_clew@xxxxxxxxxxx>
Signed-off-by: Praveenkumar I <quic_ipkumar@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230801064712.3590128-1-quic_ipkumar@xxxxxxxxxxx
Signed-off-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
 drivers/soc/qcom/qmi_encdec.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/soc/qcom/qmi_encdec.c
+++ b/drivers/soc/qcom/qmi_encdec.c
@@ -534,8 +534,8 @@ static int qmi_decode_string_elem(struct
 		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) {

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