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efi_loader: fix efi_image_region_add()

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Use start and end address consistently as half-open interval.
Simplify the code.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
This commit is contained in:
Heinrich Schuchardt 2020-07-01 20:01:52 +02:00
parent bc246c69ae
commit 28164c925e
1 changed files with 19 additions and 16 deletions
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35
lib/efi_loader/efi_signature.c
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@ -521,15 +521,19 @@ out:
} }
/** /**
* efi_image_region_add - add an entry of region * efi_image_region_add() - add an entry of region
* @regs: Pointer to array of regions * @regs: Pointer to array of regions
* @start: Start address of region * @start: Start address of region (included)
* @end: End address of region * @end: End address of region (excluded)
* @nocheck: flag against overlapped regions * @nocheck: flag against overlapped regions
* *
* Take one entry of region [@start, @end] and append it to the list * Take one entry of region [@start, @end[ and insert it into the list.
* pointed to by @regs. If @nocheck is false, overlapping among entries *
* will be checked first. * * If @nocheck is false, the list will be sorted ascending by address.
* Overlapping entries will not be allowed.
*
* * If @nocheck is true, the list will be sorted ascending by sequence
* of adding the entries. Overlapping is allowed.
* *
* Return: status code * Return: status code
*/ */
@ -553,22 +557,21 @@ efi_status_t efi_image_region_add(struct efi_image_regions *regs,
if (nocheck) if (nocheck)
continue; continue;
if (start > reg->data + reg->size) /* new data after registered region */
if (start >= reg->data + reg->size)
continue; continue;
if ((start >= reg->data && start < reg->data + reg->size) || /* new data preceding registered region */
(end > reg->data && end < reg->data + reg->size)) { if (end <= reg->data) {
EFI_PRINT("%s: new region already part of another\n",
__func__);
return EFI_INVALID_PARAMETER;
}
if (start < reg->data && end < reg->data + reg->size) {
for (j = regs->num - 1; j >= i; j--) for (j = regs->num - 1; j >= i; j--)
memcpy(&regs->reg[j], &regs->reg[j + 1], memcpy(&regs->reg[j + 1], &regs->reg[j],
sizeof(*reg)); sizeof(*reg));
break; break;
} }
/* new data overlapping registered region */
EFI_PRINT("%s: new region already part of another\n", __func__);
return EFI_INVALID_PARAMETER;
} }
reg = &regs->reg[i]; reg = &regs->reg[i];