[edk2-devel] [edk2-libc Patch 1/1] edk2-libc/StdLib: file descriptor leak in rename()

[Michael D Kinney]

Reviewed-by: Michael D Kinney <michael.d.kinneyu at intel.com>



> -----Original Message-----
> From: Jayaprakash, N <n.jayaprakash at intel.com>
> Sent: Monday, August 21, 2023 8:22 PM
> To: devel at edk2.groups.io
> Cc: Jayaprakash, N <n.jayaprakash at intel.com>; Rebecca Cran
> <rebecca at bsdio.com>; Kinney, Michael D <michael.d.kinney at intel.com>;
> Kloper, Dimitry <dimitry.kloper at intel.com>
> Subject: [edk2-libc Patch 1/1] edk2-libc/StdLib: file descriptor leak in
> rename()
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4529
> 
> rename() call leads to a function that makes open() for source file
> to be renamed. The resulting file descriptor is never closed.
> If you have to rename a couple of files this will quickly exhaust
> the descriptor table.
> The fix is trivial - just close the fd before returning from the
> function.
> 
> Cc: Rebecca Cran <rebecca at bsdio.com>
> Cc: Michael D Kinney <michael.d.kinney at intel.com>
> Cc: Jayaprakash N <n.jayaprakash at intel.com>
> Signed-off-by: Kloper Dimitry <dimitry.kloper at intel.com>
> ---
>  StdLib/LibC/Uefi/Devices/UefiShell/daShell.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/StdLib/LibC/Uefi/Devices/UefiShell/daShell.c
> b/StdLib/LibC/Uefi/Devices/UefiShell/daShell.c
> index 861765e..06fcc3b 100644
> --- a/StdLib/LibC/Uefi/Devices/UefiShell/daShell.c
> +++ b/StdLib/LibC/Uefi/Devices/UefiShell/daShell.c
> @@ -670,6 +670,7 @@ da_ShellRename(
>          free(NewFileInfo);
>          if(Status == EFI_SUCCESS) {
>            // File has been successfully renamed.  We are DONE!
> +          close(OldFd);
>            return 0;
>          }
>          errno = EFI2errno( Status );
> @@ -688,6 +689,7 @@ da_ShellRename(
>      else {
>        errno = ENOMEM;
>      }
> +    close(OldFd);
>    }
>    return -1;
>  }
> --
> 2.40.0.windows.1



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