[PATCH] libfdt: Fix signedness comparison warnings
Andre Przywara
andre.przywara at arm.com
Fri Oct 16 16:42:50 CEST 2020
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 at arm.com>
---
scripts/dtc/libfdt/fdt.c | 15 +++++++++++----
scripts/dtc/libfdt/fdt_overlay.c | 3 ++-
scripts/dtc/libfdt/fdt_ro.c | 20 +++++++++++---------
scripts/dtc/libfdt/fdt_strerror.c | 4 ++--
scripts/dtc/libfdt/fdt_sw.c | 27 +++++++++++++++------------
scripts/dtc/libfdt/fdt_wip.c | 2 +-
6 files changed, 42 insertions(+), 29 deletions(-)
diff --git a/scripts/dtc/libfdt/fdt.c b/scripts/dtc/libfdt/fdt.c
index 8e4cce3b9be..28f4e1a5f15 100644
--- 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 bd75e3dd786..7a65c35af6f 100644
--- 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 d9d52e0d56e..d984bab036b 100644
--- 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 768db66eada..b4356931b06 100644
--- 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 a8c924675a6..d9e67fa2a61 100644
--- 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 f64139e0b3d..c2d7566a67d 100644
--- 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);
--
2.17.5
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