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vfs: ioctl: prevent double-fetch in dedupe ioctl

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This prevents a double-fetch from user space that can lead to to an
undersized allocation and heap overflow.

Fixes: 54dbc15172 ("vfs: hoist the btrfs deduplication ioctl to the vfs")
Signed-off-by: Scott Bauer <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Scott Bauer 2016-07-27 19:11:29 -06:00 • committed by Linus Torvalds
commit 10eec60ce7
1 changed files with 1 additions and 0 deletions
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1
fs/ioctl.c
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@ -590,6 +590,7 @@ static long ioctl_file_dedupe_range(struct file *file, void __user *arg)
goto out;
}
same->dest_count = count;
ret = vfs_dedupe_file_range(file, same);
if (ret)
goto out;