[PATCH] Cygwin: open: Add missing unlock on error

[Mark Geisert]

Hi Takashi,

On 8/2/2026 8:22 PM, Takashi Yano wrote:
> the commit 524d75ff7398 ("Cygwin: open: Unlock fdtab before open_
> with_arch()") introduced a bug that fdtab lock was not unlocked
> when new fd cannot be allocated due to an error.
> 
> This patch adds missing unlock for fdtab lock on error.
> 
> Fixes: 524d75ff7398 ("Cygwin: open: Unlock fdtab before open_with_arch()")
> Suggested-by: Johannes Schindelin <Johannes.Schindelin@gmx.de>
> Signed-off-by: Takashi Yano <takashi.yano@nifty.ne.jp>
> Reviewed-by:
> ---
>   winsup/cygwin/syscalls.cc | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/winsup/cygwin/syscalls.cc b/winsup/cygwin/syscalls.cc
> index e3ba8c65c..8373482e9 100644
> --- a/winsup/cygwin/syscalls.cc
> +++ b/winsup/cygwin/syscalls.cc
> @@ -1554,7 +1554,10 @@ open (const char *unix_path, int flags, ...)
>         cygheap->fdtab.lock();
>         fd = cygheap->fdtab.find_unused_handle ();
>         if (fd < 0)
> -	__leave;		/* errno already set */
> +	{
> +	  cygheap->fdtab.unlock();
> +	  __leave;		/* errno already set */
> +	}
>         cygheap->fdtab[fd] = fh; /* tentative setting to mark as used */
>         cygheap->fdtab.unlock();
>   

This patch LGTM.  Apologies for not catching this in my review.
Thanks & Regards,

..mark