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libfdt: fdt_move(): Fix comparison warnings 

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

This stems from "bufsize" being passed in as a signed integer, even
though we would expect a buffer size to be positive.

Short of changing the prototype, check that bufsize is not negative, and
cast it to an unsigned type in the comparison.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Message-Id: <20201001164630.4980-3-andre.przywara@arm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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Andre Przywara 2020-10-01 17:46:26 +01:00 committed by David Gibson
parent 3d7c6f4419
commit f28aa27100
1 changed files with 4 additions and 1 deletions
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libfdt/fdt.c
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@ -314,9 +314,12 @@ const char *fdt_find_string_(const char *strtab, int tabsize, const char *s)

int fdt_move(const void *fdt, void *buf, int bufsize)
{
if (!can_assume(VALID_INPUT) && bufsize < 0)
return -FDT_ERR_NOSPACE;

FDT_RO_PROBE(fdt);

if (fdt_totalsize(fdt) > bufsize)
if (fdt_totalsize(fdt) > (unsigned int)bufsize)
return -FDT_ERR_NOSPACE;

memmove(buf, fdt, fdt_totalsize(fdt));