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libfdt: Add support for disabling sanity checks

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Allow enabling ASSUME_VALID_INPUT to disable sanity checks on the device
tree and the parameters to libfdt. This assumption covers that cases where
the problem could be with either.

Signed-off-by: Simon Glass <sjg@chromium.org>
Message-Id: <20200220214557.176528-5-sjg@chromium.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Simon Glass 2020-02-20 14:45:53 -07:00 • committed by David Gibson
parent 57bc6327b8
commit 77563ae72b
2 changed files with 48 additions and 24 deletions
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11
libfdt/fdt.c
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@ -129,10 +129,11 @@ const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
{
unsigned absoffset = offset + fdt_off_dt_struct(fdt);
if ((absoffset < offset)
|| ((absoffset + len) < absoffset)
|| (absoffset + len) > fdt_totalsize(fdt))
return NULL;
if (!can_assume(VALID_INPUT))
if ((absoffset < offset)
|| ((absoffset + len) < absoffset)
|| (absoffset + len) > fdt_totalsize(fdt))
return NULL;
if (fdt_version(fdt) >= 0x11)
if (((offset + len) < offset)
@ -197,6 +198,8 @@ uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset)
int fdt_check_node_offset_(const void *fdt, int offset)
{
if (can_assume(VALID_INPUT))
return offset;
if ((offset < 0) || (offset % FDT_TAGSIZE)
|| (fdt_next_tag(fdt, offset, &offset) != FDT_BEGIN_NODE))
return -FDT_ERR_BADOFFSET;