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i2c: smbus: fix NULL function pointer dereference

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[ Upstream commit 91811a31b68d3765b3065f4bb6d7d6d84a7cfc9f ]

Baruch reported an OOPS when using the designware controller as target
only. Target-only modes break the assumption of one transfer function
always being available. Fix this by always checking the pointer in
__i2c_transfer.

Reported-by: Baruch Siach <baruch@tkos.co.il>
Closes: https://lore.kernel.org/r/4269631780e5ba789cf1ae391eec1b959def7d99.1712761976.git.baruch@tkos.co.il
Fixes: 4b1acc4333 ("i2c: core changes for slave support")
[wsa: dropped the simplification in core-smbus to avoid theoretical regressions]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Tested-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Wolfram Sang
2024-04-26 08:44:08 +02:00
committed by Greg Kroah-Hartman
parent ffe3f362de
commit 40f1d79f07
1 changed files with 6 additions and 1 deletions
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7
drivers/i2c/i2c-core-base.c
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@@ -1872,13 +1872,18 @@ static int i2c_check_for_quirks(struct i2c_adapter *adap, struct i2c_msg *msgs,
* Returns negative errno, else the number of messages executed. * Returns negative errno, else the number of messages executed.
* *
* Adapter lock must be held when calling this function. No debug logging * Adapter lock must be held when calling this function. No debug logging
* takes place. adap->algo->master_xfer existence isn't checked. * takes place.
*/ */
int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{ {
unsigned long orig_jiffies; unsigned long orig_jiffies;
int ret, try; int ret, try;
if (!adap->algo->master_xfer) {
dev_dbg(&adap->dev, "I2C level transfers not supported\n");
return -EOPNOTSUPP;
}
if (WARN_ON(!msgs || num < 1)) if (WARN_ON(!msgs || num < 1))
return -EINVAL; return -EINVAL;