Re: [PATCH v1] linux/ofpath: Add missing strdup failure checks

[Avnish Chouhan <avnish@linux.ibm.com>]

On 2025-11-19 17:41, grub-devel-request@gnu.org wrote:
> Message: 1
> Date: Wed, 19 Nov 2025 15:30:47 +0530
> From: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
> To: grub-devel@gnu.org
> Cc: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>, ssrish@linux.ibm.com,
> 	sridharm@linux.ibm.com, stefanb@linux.ibm.com
> Subject: [PATCH v1] linux/ofpath: Add missing strdup failure checks
> Message-ID: <20251119100047.6573-1-sudhakar@linux.ibm.com>
> 
> Segmentation faults or undefined behaviour may result from a null 
> pointer
> dereference in strip_trailing_digits and grub_util_devname_to_ofpath if
> strdup() fails. Therefore, I added a NULL check to fix this.
> 
> Signed-off-by: Sudhakar Kuppusamy <sudhakar@linux.ibm.com>
> Reviewed-by: Srish Srinivasan <ssrish@linux.ibm.com>
> ---

Reviewed-by: Avnish Chouhan <avnish@linux.ibm.com>

Regards,
Avnish Chouhan

>  grub-core/osdep/linux/ofpath.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/grub-core/osdep/linux/ofpath.c 
> b/grub-core/osdep/linux/ofpath.c
> index a6153d359..a3747b248 100644
> --- a/grub-core/osdep/linux/ofpath.c
> +++ b/grub-core/osdep/linux/ofpath.c
> @@ -695,6 +695,9 @@ strip_trailing_digits (const char *p)
>    char *new, *end;
> 
>    new = strdup (p);
> +  if (new == NULL)
> +    return NULL;
> +
>    end = new + strlen(new) - 1;
>    while (end >= new)
>      {
> @@ -709,13 +712,18 @@ strip_trailing_digits (const char *p)
>  char *
>  grub_util_devname_to_ofpath (const char *sys_devname)
>  {
> -  char *name_buf, *device, *devnode, *devicenode, *ofpath;
> +  char *name_buf, *device, *devnode, *devicenode, *ofpath = NULL;
> 
>    name_buf = xrealpath (sys_devname);
> 
>    device = get_basename (name_buf);
>    devnode = strip_trailing_digits (name_buf);
> +  if (devnode == NULL)
> +    goto devnode_fail;
> +
>    devicenode = strip_trailing_digits (device);
> +  if (devicenode == NULL)
> +    goto devicenode_fail;
> 
>    if (device[0] == 'h' && device[1] == 'd')
>      ofpath = of_path_of_ide(name_buf, device, devnode, devicenode);
> @@ -741,8 +749,10 @@ grub_util_devname_to_ofpath (const char 
> *sys_devname)
>        ofpath = NULL;
>      }
> 
> -  free (devnode);
>    free (devicenode);
> + devicenode_fail:
> +  free (devnode);
> + devnode_fail:
>    free (name_buf);
> 
>    return ofpath;
> --
> 2.50.1 (Apple Git-155)

_______________________________________________
Grub-devel mailing list
Grub-devel@gnu.org
https://lists.gnu.org/mailman/listinfo/grub-devel