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Message-ID: <20251003092544.12118-1-shahriyar@posteo.de>
Date: Fri, 03 Oct 2025 09:25:47 +0000
From: Shahriyar Jalayeri <shahriyar@...teo.de>
To: peterhuewe@....de
Cc: jarkko@...nel.org,
jgg@...pe.ca,
linux-integrity@...r.kernel.org,
linux-kernel@...r.kernel.org,
Shahriyar Jalayeri <shahriyar@...teo.de>
Subject: [PATCH] tpm: infineon: add bounds check in tpm_inf_recv
Ensure tpm_inf_recv() does not overflow the provided buffer when
the TPM reports more data than the caller expects.
Signed-off-by: Shahriyar Jalayeri <shahriyar@...teo.de>
---
drivers/char/tpm/tpm_infineon.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/char/tpm/tpm_infineon.c b/drivers/char/tpm/tpm_infineon.c
index 7638b65b8..eb6dd55ff 100644
--- a/drivers/char/tpm/tpm_infineon.c
+++ b/drivers/char/tpm/tpm_infineon.c
@@ -250,6 +250,12 @@ static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
number_of_wtx = 0;
recv_begin:
+ if (count < 4) {
+ dev_err(&chip->dev,
+ "count less than the header size!\n");
+ return -EIO;
+ }
+
/* start receiving header */
for (i = 0; i < 4; i++) {
ret = wait(chip, STAT_RDA);
@@ -268,6 +274,12 @@ static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
/* size of the data received */
size = ((buf[2] << 8) | buf[3]);
+ if (size > count) {
+ dev_err(&chip->dev,
+ "Buffer too small for incoming data!\n");
+ return -EIO;
+ }
+
for (i = 0; i < size; i++) {
wait(chip, STAT_RDA);
buf[i] = tpm_data_in(RDFIFO);
--
2.43.0
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