libfdt: Fix signedness comparison warnings

This is a combination of upstream libfdt commits to fix warnings about
comparing signed and unsigned integers:
==========
scripts/dtc/libfdt/fdt.c: In function ‘fdt_offset_ptr’:
scripts/dtc/libfdt/fdt.c:137:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if ((absoffset < offset)
...
==========

For a detailed description of the fixes, see the dtc repo:
https://git.kernel.org/pub/scm/utils/dtc/dtc.git/log/?id=73e0f143b73d808

For this patch the commits between 73e0f143b73d8088 and ca19c3db2bf62000
have been combined and adjusted for the slight differences in U-Boot's
libfdt code base.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>

diff --git a/scripts/dtc/libfdt/fdt.c b/scripts/dtc/libfdt/fdt.c
index 8e4cce3..28f4e1a 100644 (file)
--- a/scripts/dtc/libfdt/fdt.c
+++ b/scripts/dtc/libfdt/fdt.c
@@ -131,16 +131,20 @@ int fdt_check_header(const void *fdt)
 
 const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len)
 {
-       unsigned absoffset = offset + fdt_off_dt_struct(fdt);
+       unsigned int uoffset = offset;
+       unsigned int absoffset = offset + fdt_off_dt_struct(fdt);
+
+       if (offset < 0)
+               return NULL;
 
        if (fdt_chk_basic())
-               if ((absoffset < offset)
+               if ((absoffset < uoffset)
                    || ((absoffset + len) < absoffset)
                    || (absoffset + len) > fdt_totalsize(fdt))
                        return NULL;
 
        if (!fdt_chk_version() || fdt_version(fdt) >= 0x11)
-               if (((offset + len) < offset)
+               if (((uoffset + len) < uoffset)
                    || ((offset + len) > fdt_size_dt_struct(fdt)))
                        return NULL;
 
@@ -302,9 +306,12 @@ const char *fdt_find_string_(const char *strtab, int tabsize, const char *s)
 
 int fdt_move(const void *fdt, void *buf, int bufsize)
 {
+       if (fdt_chk_basic() && 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));

diff --git a/scripts/dtc/libfdt/fdt_overlay.c b/scripts/dtc/libfdt/fdt_overlay.c
index bd75e3d..7a65c35 100644 (file)
--- a/scripts/dtc/libfdt/fdt_overlay.c
+++ b/scripts/dtc/libfdt/fdt_overlay.c
@@ -241,6 +241,7 @@ static int overlay_update_local_node_references(void *fdto,
 
                if (fixup_len % sizeof(uint32_t))
                        return -FDT_ERR_BADOVERLAY;
+               fixup_len /= sizeof(uint32_t);
 
                tree_val = fdt_getprop(fdto, tree_node, name, &tree_len);
                if (!tree_val) {
@@ -250,7 +251,7 @@ static int overlay_update_local_node_references(void *fdto,
                        return tree_len;
                }
 
-               for (i = 0; i < (fixup_len / sizeof(uint32_t)); i++) {
+               for (i = 0; i < fixup_len; i++) {
                        fdt32_t adj_val;
                        uint32_t poffset;
 

diff --git a/scripts/dtc/libfdt/fdt_ro.c b/scripts/dtc/libfdt/fdt_ro.c
index d9d52e0..d984bab 100644 (file)
--- a/scripts/dtc/libfdt/fdt_ro.c
+++ b/scripts/dtc/libfdt/fdt_ro.c
@@ -53,7 +53,7 @@ const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
 
        err = -FDT_ERR_BADOFFSET;
        absoffset = stroffset + fdt_off_dt_strings(fdt);
-       if (absoffset >= totalsize)
+       if (absoffset >= (unsigned)totalsize)
                goto fail;
        len = totalsize - absoffset;
 
@@ -61,17 +61,19 @@ const char *fdt_get_string(const void *fdt, int stroffset, int *lenp)
                if (stroffset < 0)
                        goto fail;
                if (!fdt_chk_version() || fdt_version(fdt) >= 17) {
-                       if (stroffset >= fdt_size_dt_strings(fdt))
+                       if ((unsigned)stroffset >= fdt_size_dt_strings(fdt))
                                goto fail;
                        if ((fdt_size_dt_strings(fdt) - stroffset) < len)
                                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;
@@ -157,8 +159,8 @@ int fdt_generate_phandle(const void *fdt, uint32_t *phandle)
 
 static const struct fdt_reserve_entry *fdt_mem_rsv(const void *fdt, int n)
 {
-       int offset = n * sizeof(struct fdt_reserve_entry);
-       int absoffset = fdt_off_mem_rsvmap(fdt) + offset;
+       unsigned int offset = n * sizeof(struct fdt_reserve_entry);
+       unsigned int absoffset = fdt_off_mem_rsvmap(fdt) + offset;
 
        if (fdt_chk_extra()) {
                if (absoffset < fdt_off_mem_rsvmap(fdt))
@@ -679,7 +681,7 @@ int fdt_node_offset_by_phandle(const void *fdt, uint32_t phandle)
 {
        int offset;
 
-       if ((phandle == 0) || (phandle == -1))
+       if ((phandle == 0) || (phandle == ~0U))
                return -FDT_ERR_BADPHANDLE;
 
        FDT_RO_PROBE(fdt);

diff --git a/scripts/dtc/libfdt/fdt_strerror.c b/scripts/dtc/libfdt/fdt_strerror.c
index 768db66..b435693 100644 (file)
--- a/scripts/dtc/libfdt/fdt_strerror.c
+++ b/scripts/dtc/libfdt/fdt_strerror.c
@@ -40,7 +40,7 @@ static struct fdt_errtabent fdt_errtable[] = {
        FDT_ERRTABENT(FDT_ERR_NOPHANDLES),
        FDT_ERRTABENT(FDT_ERR_BADFLAGS),
 };
-#define FDT_ERRTABSIZE (sizeof(fdt_errtable) / sizeof(fdt_errtable[0]))
+#define FDT_ERRTABSIZE ((int)(sizeof(fdt_errtable) / sizeof(fdt_errtable[0])))
 
 const char *fdt_strerror(int errval)
 {
@@ -48,7 +48,7 @@ const char *fdt_strerror(int errval)
                return "<valid offset/length>";
        else if (errval == 0)
                return "<no error>";
-       else if (errval > -FDT_ERRTABSIZE) {
+       else if (-errval < FDT_ERRTABSIZE) {
                const char *s = fdt_errtable[-errval].str;
 
                if (s)

diff --git a/scripts/dtc/libfdt/fdt_sw.c b/scripts/dtc/libfdt/fdt_sw.c
index a8c9246..d9e67fa 100644 (file)
--- a/scripts/dtc/libfdt/fdt_sw.c
+++ b/scripts/dtc/libfdt/fdt_sw.c
@@ -96,8 +96,8 @@ static inline uint32_t sw_flags(void *fdt)
 
 static void *fdt_grab_space_(void *fdt, size_t len)
 {
-       int offset = fdt_size_dt_struct(fdt);
-       int spaceleft;
+       unsigned int offset = fdt_size_dt_struct(fdt);
+       unsigned int spaceleft;
 
        spaceleft = fdt_totalsize(fdt) - fdt_off_dt_struct(fdt)
                - fdt_size_dt_strings(fdt);
@@ -111,8 +111,8 @@ static void *fdt_grab_space_(void *fdt, size_t len)
 
 int fdt_create_with_flags(void *buf, int bufsize, uint32_t flags)
 {
-       const size_t hdrsize = FDT_ALIGN(sizeof(struct fdt_header),
-                                        sizeof(struct fdt_reserve_entry));
+       const int hdrsize = FDT_ALIGN(sizeof(struct fdt_header),
+                                     sizeof(struct fdt_reserve_entry));
        void *fdt = buf;
 
        if (bufsize < hdrsize)
@@ -155,13 +155,16 @@ int fdt_resize(void *fdt, void *buf, int bufsize)
 
        FDT_SW_PROBE(fdt);
 
+       if (bufsize < 0)
+               return -FDT_ERR_NOSPACE;
+
        headsize = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
        tailsize = fdt_size_dt_strings(fdt);
 
        if (fdt_chk_extra() && (headsize + tailsize) > fdt_totalsize(fdt))
                return -FDT_ERR_INTERNAL;
 
-       if ((headsize + tailsize) > bufsize)
+       if ((headsize + tailsize) > (unsigned)bufsize)
                return -FDT_ERR_NOSPACE;
 
        oldtail = (char *)fdt + fdt_totalsize(fdt) - tailsize;
@@ -249,18 +252,18 @@ int fdt_end_node(void *fdt)
 static int fdt_add_string_(void *fdt, const char *s)
 {
        char *strtab = (char *)fdt + fdt_totalsize(fdt);
-       int strtabsize = fdt_size_dt_strings(fdt);
-       int len = strlen(s) + 1;
-       int struct_top, offset;
+       unsigned int strtabsize = fdt_size_dt_strings(fdt);
+       unsigned int len = strlen(s) + 1;
+       unsigned int struct_top, offset;
 
-       offset = -strtabsize - len;
+       offset = strtabsize + len;
        struct_top = fdt_off_dt_struct(fdt) + fdt_size_dt_struct(fdt);
-       if (fdt_totalsize(fdt) + offset < struct_top)
+       if (fdt_totalsize(fdt) - offset < struct_top)
                return 0; /* no more room :( */
 
-       memcpy(strtab + offset, s, len);
+       memcpy(strtab - offset, s, len);
        fdt_set_size_dt_strings(fdt, strtabsize + len);
-       return offset;
+       return -offset;
 }
 
 /* Must only be used to roll back in case of error */

diff --git a/scripts/dtc/libfdt/fdt_wip.c b/scripts/dtc/libfdt/fdt_wip.c
index f64139e..c2d7566 100644 (file)
--- a/scripts/dtc/libfdt/fdt_wip.c
+++ b/scripts/dtc/libfdt/fdt_wip.c
@@ -23,7 +23,7 @@ int fdt_setprop_inplace_namelen_partial(void *fdt, int nodeoffset,
        if (!propval)
                return proplen;
 
-       if (proplen < (len + idx))
+       if ((unsigned)proplen < (len + idx))
                return -FDT_ERR_NOSPACE;
 
        memcpy((char *)propval + idx, val, len);