From: Tzung-Bi Shih <tzungbi@kernel.org>
To: bleung@chromium.org, groeck@chromium.org
Cc: chrome-platform@lists.linux.dev, tzungbi@kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 6/6] platform/chrome: cros_ec_spi: drop BUG_ON()
Date: Thu, 12 May 2022 16:36:27 +0800 [thread overview]
Message-ID: <20220512083627.885338-7-tzungbi@kernel.org> (raw)
In-Reply-To: <20220512083627.885338-1-tzungbi@kernel.org>
It is overkill to crash the kernel if the `din` buffer is going to full
or overflow.
Drop the BUG_ON() and return -EINVAL instead.
Signed-off-by: Tzung-Bi Shih <tzungbi@kernel.org>
---
drivers/platform/chrome/cros_ec_spi.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/platform/chrome/cros_ec_spi.c b/drivers/platform/chrome/cros_ec_spi.c
index 589f18e9537d..0a938f317adc 100644
--- a/drivers/platform/chrome/cros_ec_spi.c
+++ b/drivers/platform/chrome/cros_ec_spi.c
@@ -160,7 +160,8 @@ static int receive_n_bytes(struct cros_ec_device *ec_dev, u8 *buf, int n)
struct spi_message msg;
int ret;
- BUG_ON(buf - ec_dev->din + n > ec_dev->din_size);
+ if (buf - ec_dev->din + n > ec_dev->din_size)
+ return -EINVAL;
memset(&trans, 0, sizeof(trans));
trans.cs_change = 1;
@@ -197,7 +198,8 @@ static int cros_ec_spi_receive_packet(struct cros_ec_device *ec_dev,
unsigned long deadline;
int todo;
- BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT);
+ if (ec_dev->din_size < EC_MSG_PREAMBLE_COUNT)
+ return -EINVAL;
/* Receive data until we see the header byte */
deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS);
@@ -237,7 +239,8 @@ static int cros_ec_spi_receive_packet(struct cros_ec_device *ec_dev,
* start of our buffer
*/
todo = end - ++ptr;
- BUG_ON(todo < 0 || todo > ec_dev->din_size);
+ if (todo < 0 || todo > ec_dev->din_size)
+ return -EINVAL;
todo = min(todo, need_len);
memmove(ec_dev->din, ptr, todo);
ptr = ec_dev->din + todo;
@@ -305,7 +308,8 @@ static int cros_ec_spi_receive_response(struct cros_ec_device *ec_dev,
unsigned long deadline;
int todo;
- BUG_ON(ec_dev->din_size < EC_MSG_PREAMBLE_COUNT);
+ if (ec_dev->din_size < EC_MSG_PREAMBLE_COUNT)
+ return -EINVAL;
/* Receive data until we see the header byte */
deadline = jiffies + msecs_to_jiffies(EC_MSG_DEADLINE_MS);
@@ -345,7 +349,8 @@ static int cros_ec_spi_receive_response(struct cros_ec_device *ec_dev,
* start of our buffer
*/
todo = end - ++ptr;
- BUG_ON(todo < 0 || todo > ec_dev->din_size);
+ if (todo < 0 || todo > ec_dev->din_size)
+ return -EINVAL;
todo = min(todo, need_len);
memmove(ec_dev->din, ptr, todo);
ptr = ec_dev->din + todo;
--
2.36.0.512.ge40c2bad7a-goog
next prev parent reply other threads:[~2022-05-12 8:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-12 8:36 [PATCH 0/6] platform/chrome: get rid of BUG_ON() Tzung-Bi Shih
2022-05-12 8:36 ` [PATCH 1/6] platform/chrome: cros_ec_proto: drop unneeded BUG_ON() in prepare_packet() Tzung-Bi Shih
2022-05-12 14:53 ` Guenter Roeck
2022-05-12 8:36 ` [PATCH 2/6] platform/chrome: correct cros_ec_prepare_tx() usage Tzung-Bi Shih
2022-05-12 15:11 ` Guenter Roeck
2022-05-12 8:36 ` [PATCH 3/6] platform/chrome: cros_ec_proto: drop BUG_ON() in cros_ec_prepare_tx() Tzung-Bi Shih
2022-05-12 15:10 ` Guenter Roeck
2022-05-12 8:36 ` [PATCH 4/6] platform/chrome: cros_ec_proto: drop BUG_ON() in cros_ec_get_host_event() Tzung-Bi Shih
2022-05-12 15:12 ` Guenter Roeck
2022-05-12 8:36 ` [PATCH 5/6] platform/chrome: cros_ec_i2c: drop BUG_ON() in cros_ec_pkt_xfer_i2c() Tzung-Bi Shih
2022-05-12 15:12 ` Guenter Roeck
2022-05-12 8:36 ` Tzung-Bi Shih [this message]
2022-05-12 15:14 ` [PATCH 6/6] platform/chrome: cros_ec_spi: drop BUG_ON() Guenter Roeck
2022-05-13 5:00 ` Tzung-Bi Shih
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