diff options
Diffstat (limited to 'scripts/dtc/libfdt')
| -rw-r--r-- | scripts/dtc/libfdt/fdt.c | 13 | ||||
| -rw-r--r-- | scripts/dtc/libfdt/fdt_ro.c | 100 | ||||
| -rw-r--r-- | scripts/dtc/libfdt/fdt_rw.c | 2 | ||||
| -rw-r--r-- | scripts/dtc/libfdt/libfdt.h | 73 |
4 files changed, 179 insertions, 9 deletions
diff --git a/scripts/dtc/libfdt/fdt.c b/scripts/dtc/libfdt/fdt.c index 2ce6a44179de..22286a1aaeaf 100644 --- a/scripts/dtc/libfdt/fdt.c +++ b/scripts/dtc/libfdt/fdt.c @@ -76,18 +76,19 @@ int fdt_check_header(const void *fdt) const void *fdt_offset_ptr(const void *fdt, int offset, unsigned int len) { - const char *p; + unsigned absoffset = offset + fdt_off_dt_struct(fdt); + + if ((absoffset < offset) + || ((absoffset + len) < absoffset) + || (absoffset + len) > fdt_totalsize(fdt)) + return NULL; if (fdt_version(fdt) >= 0x11) if (((offset + len) < offset) || ((offset + len) > fdt_size_dt_struct(fdt))) return NULL; - p = _fdt_offset_ptr(fdt, offset); - - if (p + len < p) - return NULL; - return p; + return _fdt_offset_ptr(fdt, offset); } uint32_t fdt_next_tag(const void *fdt, int startoffset, int *nextoffset) diff --git a/scripts/dtc/libfdt/fdt_ro.c b/scripts/dtc/libfdt/fdt_ro.c index a65e4b5b72b6..e5b313682007 100644 --- a/scripts/dtc/libfdt/fdt_ro.c +++ b/scripts/dtc/libfdt/fdt_ro.c @@ -538,6 +538,106 @@ int fdt_stringlist_contains(const char *strlist, int listlen, const char *str) return 0; } +int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property) +{ + const char *list, *end; + int length, count = 0; + + list = fdt_getprop(fdt, nodeoffset, property, &length); + if (!list) + return -length; + + end = list + length; + + while (list < end) { + length = strnlen(list, end - list) + 1; + + /* Abort if the last string isn't properly NUL-terminated. */ + if (list + length > end) + return -FDT_ERR_BADVALUE; + + list += length; + count++; + } + + return count; +} + +int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property, + const char *string) +{ + int length, len, idx = 0; + const char *list, *end; + + list = fdt_getprop(fdt, nodeoffset, property, &length); + if (!list) + return -length; + + len = strlen(string) + 1; + end = list + length; + + while (list < end) { + length = strnlen(list, end - list) + 1; + + /* Abort if the last string isn't properly NUL-terminated. */ + if (list + length > end) + return -FDT_ERR_BADVALUE; + + if (length == len && memcmp(list, string, length) == 0) + return idx; + + list += length; + idx++; + } + + return -FDT_ERR_NOTFOUND; +} + +const char *fdt_stringlist_get(const void *fdt, int nodeoffset, + const char *property, int idx, + int *lenp) +{ + const char *list, *end; + int length; + + list = fdt_getprop(fdt, nodeoffset, property, &length); + if (!list) { + if (lenp) + *lenp = length; + + return NULL; + } + + end = list + length; + + while (list < end) { + length = strnlen(list, end - list) + 1; + + /* Abort if the last string isn't properly NUL-terminated. */ + if (list + length > end) { + if (lenp) + *lenp = -FDT_ERR_BADVALUE; + + return NULL; + } + + if (idx == 0) { + if (lenp) + *lenp = length - 1; + + return list; + } + + list += length; + idx--; + } + + if (lenp) + *lenp = -FDT_ERR_NOTFOUND; + + return NULL; +} + int fdt_node_check_compatible(const void *fdt, int nodeoffset, const char *compatible) { diff --git a/scripts/dtc/libfdt/fdt_rw.c b/scripts/dtc/libfdt/fdt_rw.c index 70adec6c371b..8be02b1f68f3 100644 --- a/scripts/dtc/libfdt/fdt_rw.c +++ b/scripts/dtc/libfdt/fdt_rw.c @@ -101,6 +101,8 @@ static int _fdt_splice(void *fdt, void *splicepoint, int oldlen, int newlen) if (((p + oldlen) < p) || ((p + oldlen) > end)) return -FDT_ERR_BADOFFSET; + if ((p < (char *)fdt) || ((end - oldlen + newlen) < (char *)fdt)) + return -FDT_ERR_BADOFFSET; if ((end - oldlen + newlen) > ((char *)fdt + fdt_totalsize(fdt))) return -FDT_ERR_NOSPACE; memmove(p + newlen, p + oldlen, end - p - oldlen); diff --git a/scripts/dtc/libfdt/libfdt.h b/scripts/dtc/libfdt/libfdt.h index ea35ac3c9be4..59ca33976e56 100644 --- a/scripts/dtc/libfdt/libfdt.h +++ b/scripts/dtc/libfdt/libfdt.h @@ -121,7 +121,12 @@ /* FDT_ERR_BADNCELLS: Device tree has a #address-cells, #size-cells * or similar property with a bad format or value */ -#define FDT_ERR_MAX 14 +#define FDT_ERR_BADVALUE 15 + /* FDT_ERR_BADVALUE: Device tree has a property with an unexpected + * value. For example: a property expected to contain a string list + * is not NUL-terminated within the length of its value. */ + +#define FDT_ERR_MAX 15 /**********************************************************************/ /* Low-level functions (you probably don't need these) */ @@ -457,8 +462,8 @@ const struct fdt_property *fdt_get_property_by_offset(const void *fdt, * @namelen: number of characters of name to consider * @lenp: pointer to an integer variable (will be overwritten) or NULL * - * Identical to fdt_get_property_namelen(), but only examine the first - * namelen characters of name for matching the property name. + * Identical to fdt_get_property(), but only examine the first namelen + * characters of name for matching the property name. */ const struct fdt_property *fdt_get_property_namelen(const void *fdt, int nodeoffset, @@ -868,6 +873,68 @@ int fdt_node_offset_by_compatible(const void *fdt, int startoffset, */ int fdt_stringlist_contains(const char *strlist, int listlen, const char *str); +/** + * fdt_stringlist_count - count the number of strings in a string list + * @fdt: pointer to the device tree blob + * @nodeoffset: offset of a tree node + * @property: name of the property containing the string list + * @return: + * the number of strings in the given property + * -FDT_ERR_BADVALUE if the property value is not NUL-terminated + * -FDT_ERR_NOTFOUND if the property does not exist + */ +int fdt_stringlist_count(const void *fdt, int nodeoffset, const char *property); + +/** + * fdt_stringlist_search - find a string in a string list and return its index + * @fdt: pointer to the device tree blob + * @nodeoffset: offset of a tree node + * @property: name of the property containing the string list + * @string: string to look up in the string list + * + * Note that it is possible for this function to succeed on property values + * that are not NUL-terminated. That's because the function will stop after + * finding the first occurrence of @string. This can for example happen with + * small-valued cell properties, such as #address-cells, when searching for + * the empty string. + * + * @return: + * the index of the string in the list of strings + * -FDT_ERR_BADVALUE if the property value is not NUL-terminated + * -FDT_ERR_NOTFOUND if the property does not exist or does not contain + * the given string + */ +int fdt_stringlist_search(const void *fdt, int nodeoffset, const char *property, + const char *string); + +/** + * fdt_stringlist_get() - obtain the string at a given index in a string list + * @fdt: pointer to the device tree blob + * @nodeoffset: offset of a tree node + * @property: name of the property containing the string list + * @index: index of the string to return + * @lenp: return location for the string length or an error code on failure + * + * Note that this will successfully extract strings from properties with + * non-NUL-terminated values. For example on small-valued cell properties + * this function will return the empty string. + * + * If non-NULL, the length of the string (on success) or a negative error-code + * (on failure) will be stored in the integer pointer to by lenp. + * + * @return: + * A pointer to the string at the given index in the string list or NULL on + * failure. On success the length of the string will be stored in the memory + * location pointed to by the lenp parameter, if non-NULL. On failure one of + * the following negative error codes will be returned in the lenp parameter + * (if non-NULL): + * -FDT_ERR_BADVALUE if the property value is not NUL-terminated + * -FDT_ERR_NOTFOUND if the property does not exist + */ +const char *fdt_stringlist_get(const void *fdt, int nodeoffset, + const char *property, int index, + int *lenp); + /**********************************************************************/ /* Read-only functions (addressing related) */ /**********************************************************************/ |