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Btrfs: fix memory leak in the extent_same ioctl

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We were allocating memory with memdup_user() but we were never releasing
that memory. This affected pretty much every call to the ioctl, whether
it deduplicated extents or not.

This issue was reported on IRC by Julian Taylor and on the mailing list
by Marcel Ritter, credit goes to them for finding the issue.

Reported-by: Julian Taylor <jtaylor.debian@googlemail.com>
Reported-by: Marcel Ritter <ritter.marcel@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Mark Fasheh <mfasheh@suse.de>
This commit is contained in:
Filipe Manana 2015-07-03 08:36:11 +01:00
parent c1aa45759e
commit 497b4050e0
1 changed files with 3 additions and 1 deletions
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4
fs/btrfs/ioctl.c
View file

@ -3090,7 +3090,7 @@ static int btrfs_extent_same(struct inode *src, u64 loff, u64 olen,
static long btrfs_ioctl_file_extent_same(struct file *file,
struct btrfs_ioctl_same_args __user *argp)
{
struct btrfs_ioctl_same_args *same;
struct btrfs_ioctl_same_args *same = NULL;
struct btrfs_ioctl_same_extent_info *info;
struct inode *src = file_inode(file);
u64 off;
@ -3120,6 +3120,7 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
if (IS_ERR(same)) {
ret = PTR_ERR(same);
same = NULL;
goto out;
}
@ -3190,6 +3191,7 @@ static long btrfs_ioctl_file_extent_same(struct file *file,
out:
mnt_drop_write_file(file);
kfree(same);
return ret;
}