From f28aa271000bfeaa765b824a8a3e7b170da12925 Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Thu, 1 Oct 2020 17:46:26 +0100 Subject: [PATCH] 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 Message-Id: <20201001164630.4980-3-andre.przywara@arm.com> Signed-off-by: David Gibson --- libfdt/fdt.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/libfdt/fdt.c b/libfdt/fdt.c index 04e1e06..6cf2fa0 100644 --- a/libfdt/fdt.c +++ b/libfdt/fdt.c @@ -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));