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libfdt: fdt_get_string(): Fix sequential write comparison warnings

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With -Wsign-compare, compilers warn about a mismatching signedness in
comparisons in fdt_get_string().

Introduce a new usigned variable, which holds the actual (negated)
stroffset value, so we avoid negating all the other variables and have
proper types everywhere.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Message-Id: <20201001164630.4980-6-andre.przywara@arm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Andre Przywara 2020-10-01 17:46:29 +01:00 committed by David Gibson
parent 82525f41d5
commit 6c2be7d853
1 changed files with 6 additions and 4 deletions
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10
libfdt/fdt_ro.c
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@ -67,11 +67,13 @@ const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
len = fdt_size_dt_strings(fdt) - stroffset;
}
} else if (fdt_magic(fdt) == FDT_SW_MAGIC) {
if ((stroffset >= 0)
|| (stroffset < -fdt_size_dt_strings(fdt)))
unsigned int sw_stroffset = -stroffset;
if ((stroffset >= 0) ||
(sw_stroffset > fdt_size_dt_strings(fdt)))
goto fail;
if ((-stroffset) < len)
len = -stroffset;
if (sw_stroffset < len)
len = sw_stroffset;
} else {
err = -FDT_ERR_INTERNAL;
goto fail;