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| author | David Gibson <david@gibson.dropbear.id.au> | 2016-12-20 14:58:44 (GMT) |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2017-01-14 01:19:45 (GMT) |
| commit | 46743c412de57158bde73a904511519d1fdab609 (patch) | |
| tree | e41d21a4e24304611a9870294dbd716ea0ee7928 /lib/libfdt | |
| parent | 70c1e0474a9df2c4493b4e2330cc41d3132b4e90 (diff) | |
| download | u-boot-46743c412de57158bde73a904511519d1fdab609.tar.xz | |
libfdt: Correct fdt handling of overlays without fixups and base trees without symbols
The fdt_overlay_apply() function purports to support the edge cases where
an overlay has no fixups to be applied, or a base tree which has no
symbols (the latter can only work if the former is also true). However it
gets it wrong in a couple of small ways:
* In the no fixups case, it doesn't fail immediately, but will attempt
fdt_for_each_property_offset() giving -FDT_ERR_NOTFOUND as the node
offset, which will fail. Instead it should succeed immediately, since
there's nothing to do.
* In the case of no symbols, it again doesn't fail immediately. However
if there is an actual fixup it will fail with an unexpected error,
because -FDT_ERR_NOTFOUND is passed to fdt_getprop() when attempting to
look up the symbols. We should instead return -FDT_ERR_NOTFOUND
directly.
Both of these errors lead to the code returning misleading error codes in
failing cases.
[ DTC commit: 7d8ef6e1db9794f72805a0855f4f7f12fadd03d3 ]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'lib/libfdt')
| -rw-r--r-- | lib/libfdt/fdt_overlay.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/libfdt/fdt_overlay.c b/lib/libfdt/fdt_overlay.c index bb41404..56cb70e 100644 --- a/lib/libfdt/fdt_overlay.c +++ b/lib/libfdt/fdt_overlay.c @@ -359,6 +359,9 @@ static int overlay_fixup_one_phandle(void *fdt, void *fdto, int symbol_off, fixup_off; int prop_len; + if (symbols_off < 0) + return symbols_off; + symbol_path = fdt_getprop(fdt, symbols_off, label, &prop_len); if (!symbol_path) @@ -492,7 +495,9 @@ static int overlay_fixup_phandles(void *fdt, void *fdto) /* We can have overlays without any fixups */ fixups_off = fdt_path_offset(fdto, "/__fixups__"); - if ((fixups_off < 0 && (fixups_off != -FDT_ERR_NOTFOUND))) + if (fixups_off == -FDT_ERR_NOTFOUND) + return 0; /* nothing to do */ + if (fixups_off < 0) return fixups_off; /* And base DTs without symbols */ |