From 3585ed5f9b11a6094dd991d76a1541e5d03b986a Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 23 Feb 2022 17:47:17 +0200 Subject: [PATCH] auxdisplay: lcd2s: Fix memory leak in ->remove() commit 898c0a15425a5bcaa8d44bd436eae5afd2483796 upstream. Once allocated the struct lcd2s_data is never freed. Fix the memory leak by switching to devm_kzalloc(). Fixes: 8c9108d014c5 ("auxdisplay: add a driver for lcd2s character display") Cc: Lars Poeschel Signed-off-by: Andy Shevchenko Signed-off-by: Miguel Ojeda Signed-off-by: Greg Kroah-Hartman --- drivers/auxdisplay/lcd2s.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/drivers/auxdisplay/lcd2s.c b/drivers/auxdisplay/lcd2s.c index ea9d75ad4f160..7b9cfbbaf0079 100644 --- a/drivers/auxdisplay/lcd2s.c +++ b/drivers/auxdisplay/lcd2s.c @@ -298,6 +298,10 @@ static int lcd2s_i2c_probe(struct i2c_client *i2c, I2C_FUNC_SMBUS_WRITE_BLOCK_DATA)) return -EIO; + lcd2s = devm_kzalloc(&i2c->dev, sizeof(*lcd2s), GFP_KERNEL); + if (!lcd2s) + return -ENOMEM; + /* Test, if the display is responding */ err = lcd2s_i2c_smbus_write_byte(i2c, LCD2S_CMD_DISPLAY_OFF); if (err < 0) @@ -307,12 +311,6 @@ static int lcd2s_i2c_probe(struct i2c_client *i2c, if (!lcd) return -ENOMEM; - lcd2s = kzalloc(sizeof(struct lcd2s_data), GFP_KERNEL); - if (!lcd2s) { - err = -ENOMEM; - goto fail1; - } - lcd->drvdata = lcd2s; lcd2s->i2c = i2c; lcd2s->charlcd = lcd; @@ -321,24 +319,22 @@ static int lcd2s_i2c_probe(struct i2c_client *i2c, err = device_property_read_u32(&i2c->dev, "display-height-chars", &lcd->height); if (err) - goto fail2; + goto fail1; err = device_property_read_u32(&i2c->dev, "display-width-chars", &lcd->width); if (err) - goto fail2; + goto fail1; lcd->ops = &lcd2s_ops; err = charlcd_register(lcd2s->charlcd); if (err) - goto fail2; + goto fail1; i2c_set_clientdata(i2c, lcd2s); return 0; -fail2: - kfree(lcd2s); fail1: kfree(lcd); return err;