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userfaultfd: add missing mmput() in error path 

This fixes a memleak if anon_inode_getfile() fails in userfaultfd().

Signed-off-by: Eric Biggers <ebiggers3@gmail.com>
Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Eric Biggers 2015-09-17 16:01:54 -07:00 committed by Linus Torvalds
parent 62bef58a55
commit c03e946fdd
1 changed files with 3 additions and 1 deletions
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4
fs/userfaultfd.c
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@ -1287,8 +1287,10 @@ static struct file *userfaultfd_file_create(int flags)
file = anon_inode_getfile("[userfaultfd]", &userfaultfd_fops, ctx, file = anon_inode_getfile("[userfaultfd]", &userfaultfd_fops, ctx,
O_RDWR | (flags & UFFD_SHARED_FCNTL_FLAGS)); O_RDWR | (flags & UFFD_SHARED_FCNTL_FLAGS));
if (IS_ERR(file)) if (IS_ERR(file)) {
mmput(ctx->mm);
kmem_cache_free(userfaultfd_ctx_cachep, ctx); kmem_cache_free(userfaultfd_ctx_cachep, ctx);
}
out: out:
return file; return file;
} }