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i2c: add param sanity check to i2c_transfer()

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The API docs describe i2c_transfer() as taking a pointer to an array
of i2c_msg containing at least 1 entry, but leaves it to the individual
drivers to sanity check the msgs and num parameters. Let's do this in
core code instead.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[wsa: changed '<= 0' to '< 1']
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Ard Biesheuvel 2018-04-03 21:11:50 +02:00 committed by Wolfram Sang
parent 090cecc669
commit 1eace8344c
1 changed files with 3 additions and 0 deletions
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drivers/i2c/i2c-core-base.c
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@ -1845,6 +1845,9 @@ int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
unsigned long orig_jiffies;
int ret, try;
if (WARN_ON(!msgs || num < 1))
return -EINVAL;
if (adap->quirks && i2c_check_for_quirks(adap, msgs, num))
return -EOPNOTSUPP;