Commit aea253ec authored by Vladimir Motyka's avatar Vladimir Motyka Committed by Chris Ball

mmc: card: fix potential null dereference of 'idata'

When allocation of idata failed there was a null dereference. Also avoid
calling kfree where it isn't needed.
Signed-off-by: default avatarVladimir Motyka <vladimir.motyka@gmail.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent cf2b5eea
......@@ -237,24 +237,24 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
idata = kzalloc(sizeof(*idata), GFP_KERNEL);
if (!idata) {
err = -ENOMEM;
goto copy_err;
goto out;
}
if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
err = -EFAULT;
goto copy_err;
goto idata_err;
}
idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
err = -EOVERFLOW;
goto copy_err;
goto idata_err;
}
idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
if (!idata->buf) {
err = -ENOMEM;
goto copy_err;
goto idata_err;
}
if (copy_from_user(idata->buf, (void __user *)(unsigned long)
......@@ -267,9 +267,10 @@ static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
copy_err:
kfree(idata->buf);
idata_err:
kfree(idata);
out:
return ERR_PTR(err);
}
static int mmc_blk_ioctl_cmd(struct block_device *bdev,
......
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