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: Vladimir Motyka <vladimir.motyka@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 407836d..126c7f4 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -237,24 +237,24 @@
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 @@
copy_err:
kfree(idata->buf);
+idata_err:
kfree(idata);
+out:
return ERR_PTR(err);
-
}
static int mmc_blk_ioctl_cmd(struct block_device *bdev,