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efi_loader: disk: Sanitize exposed devices 

When a target device is 0 bytes long, there's no point in exposing it to
the user. Let's just skip them.

Also, when an offset is passed into the efi disk creation, we should
remove this offset from the total number of sectors we can handle.

This patch fixes both things.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf 2016-08-05 14:51:47 +02:00 committed by Tom Rini
parent f9d334bdfc
commit 0812d1a094
1 changed files with 5 additions and 1 deletions
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6
lib/efi_loader/efi_disk.c
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@ -202,6 +202,10 @@ static void efi_disk_add_dev(const char *name,
struct efi_device_path_file_path *dp;
int objlen = sizeof(*diskobj) + (sizeof(*dp) * 2);
/* Don't add empty devices */
if (!desc->lba)
return;
diskobj = calloc(1, objlen);
/* Fill in object data */
@ -221,7 +225,7 @@ static void efi_disk_add_dev(const char *name,
diskobj->media.media_present = 1;
diskobj->media.block_size = desc->blksz;
diskobj->media.io_align = desc->blksz;
diskobj->media.last_block = desc->lba;
diskobj->media.last_block = desc->lba - offset;
diskobj->ops.media = &diskobj->media;
/* Fill in device path */