[LTP] mremap07.c: New test for mremap() with MREMAP_DONTUNMAP

[linuxtestproject.agent@gmail.com]

Hi Wei,

On 2026-04-17, Wei Gao wrote:
> mremap07.c: New test for mremap() with MREMAP_DONTUNMAP

> Fixes: https://github.com/linux-test-project/ltp/issues/1168

Use Closes: for GitHub issue references. Fixes: is reserved for commit
SHA references in the form: Fixes: <hash> ("<subject>").

[...]

> +static void cleanup(void)
> +{
> +	if (new_remap_addr && new_remap_addr != MAP_FAILED)
> +		SAFE_MUNMAP(new_remap_addr, page_size);
> +
> +	if (fault_addr && fault_addr != MAP_FAILED)
> +		SAFE_MUNMAP(fault_addr, page_size);
> +
> +	if (uffd != -1)
> +		SAFE_CLOSE(uffd);
> +}

SAFE_MUNMAP does not clear the pointer. If setup() fails on a subsequent
iteration before SAFE_MMAP reassigns fault_addr, cleanup() will
double-munmap the stale pointer. Add fault_addr = NULL; after the
SAFE_MUNMAP call.

---
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