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https://github.com/Divested-Mobile/DivestOS-Build.git
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90 lines
2.9 KiB
Diff
90 lines
2.9 KiB
Diff
From e9fde8664651a566df43c7439e27d59cc5d60460 Mon Sep 17 00:00:00 2001
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From: Daniel Rosenberg <drosen@google.com>
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Date: Wed, 2 Nov 2016 17:43:51 -0700
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Subject: [PATCH] ion: Fix use after free during ION_IOC_ALLOC
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If a user happens to call ION_IOC_FREE during an
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ION_IOC_ALLOC on the just allocated id, and the
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copy_to_user fails, the cleanup code will attempt
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to free an already freed handle.
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This adds a wrapper for ion_alloc that adds an
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ion_handle_get to avoid this.
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Bug: 31568617
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Change-Id: I476e5bd5372b5178a213f1fea143d270cf9361ed
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Signed-off-by: Daniel Rosenberg <drosen@google.com>
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---
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drivers/staging/android/ion/ion.c | 23 ++++++++++++++++++-----
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1 file changed, 18 insertions(+), 5 deletions(-)
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diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
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index 8bbbb38dc7c41..63e6b7d795f47 100755
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--- a/drivers/staging/android/ion/ion.c
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+++ b/drivers/staging/android/ion/ion.c
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@@ -507,9 +507,9 @@ static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
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return 0;
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}
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-struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
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+static struct ion_handle *__ion_alloc(struct ion_client *client, size_t len,
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size_t align, unsigned int heap_id_mask,
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- unsigned int flags)
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+ unsigned int flags, bool grab_handle)
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{
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struct ion_handle *handle;
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struct ion_device *dev = client->dev;
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@@ -604,6 +604,8 @@ struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
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return handle;
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mutex_lock(&client->lock);
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+ if (grab_handle)
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+ ion_handle_get(handle);
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ret = ion_handle_add(client, handle);
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mutex_unlock(&client->lock);
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if (ret) {
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@@ -613,6 +615,13 @@ struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
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return handle;
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}
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+
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+struct ion_handle *ion_alloc(struct ion_client *client, size_t len,
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+ size_t align, unsigned int heap_id_mask,
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+ unsigned int flags)
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+{
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+ return __ion_alloc(client, len, align, heap_id_mask, flags, false);
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+}
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EXPORT_SYMBOL(ion_alloc);
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static void ion_free_nolock(struct ion_client *client, struct ion_handle *handle)
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@@ -1488,10 +1497,10 @@ static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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struct ion_handle *handle;
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- handle = ion_alloc(client, data.allocation.len,
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+ handle = __ion_alloc(client, data.allocation.len,
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data.allocation.align,
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data.allocation.heap_id_mask,
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- data.allocation.flags);
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+ data.allocation.flags, true);
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if (IS_ERR(handle))
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return PTR_ERR(handle);
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@@ -1568,11 +1577,15 @@ static long ion_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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if (dir & _IOC_READ) {
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if (copy_to_user((void __user *)arg, &data, _IOC_SIZE(cmd))) {
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- if (cleanup_handle)
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+ if (cleanup_handle) {
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ion_free(client, cleanup_handle);
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+ ion_handle_put(cleanup_handle);
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+ }
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return -EFAULT;
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}
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}
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+ if (cleanup_handle)
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+ ion_handle_put(cleanup_handle);
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return ret;
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}
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