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spiffs: check if OBJ_NAME_LEN + OBJ_META_LEN is within limits

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The limit was mentioned in spiffs_config.h but was not checked.

Fixes https://github.com/espressif/esp-idf/issues/1546
This commit is contained in:
Ivan Grokhotkov 2018-01-28 23:19:43 +08:00
parent 507a3a6391
commit 594d5c1436
2 changed files with 13 additions and 5 deletions
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13
components/spiffs/Kconfig
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@ -76,10 +76,12 @@ config SPIFFS_OBJ_NAME_LEN
default 32
range 1 256
help
Object name maximum length. Note that this length
include the zero-termination character,
meaning maximum string of characters can at most be
SPIFFS_OBJ_NAME_LEN - 1.
Object name maximum length. Note that this length include the
zero-termination character, meaning maximum string of characters
can at most be SPIFFS_OBJ_NAME_LEN - 1.
SPIFFS_OBJ_NAME_LEN + SPIFFS_META_LENGTH should not exceed
SPIFFS_PAGE_SIZE - 64.
config SPIFFS_USE_MAGIC
bool "Enable SPIFFS Filesystem Magic"
@ -109,6 +111,9 @@ config SPIFFS_META_LENGTH
Set this to at least 4 bytes to enable support for saving file
modification time.
SPIFFS_OBJ_NAME_LEN + SPIFFS_META_LENGTH should not exceed
SPIFFS_PAGE_SIZE - 64.
config SPIFFS_USE_MTIME
bool "Save file modification time"
default "y"

5
components/spiffs/include/spiffs_config.h
View file

@ -153,12 +153,15 @@ extern void spiffs_api_unlock(struct spiffs_t *fs);
// changes the on-disk format, so the change is not backward-compatible.
//
// Do note: the meta length must never exceed
// logical_page_size - (SPIFFS_OBJ_NAME_LEN + 64)
// logical_page_size - (SPIFFS_OBJ_NAME_LEN + SPIFFS_PAGE_EXTRA_SIZE)
//
// This is derived from following:
// logical_page_size - (SPIFFS_OBJ_NAME_LEN + sizeof(spiffs_page_header) +
// spiffs_object_ix_header fields + at least some LUT entries)
#define SPIFFS_OBJ_META_LEN (CONFIG_SPIFFS_META_LENGTH)
#define SPIFFS_PAGE_EXTRA_SIZE (64)
_Static_assert(SPIFFS_OBJ_META_LEN + SPIFFS_OBJ_NAME_LEN + SPIFFS_PAGE_EXTRA_SIZE
<= CONFIG_SPIFFS_PAGE_SIZE, "SPIFFS_OBJ_META_LEN or SPIFFS_OBJ_NAME_LEN too long");
// Size of buffer allocated on stack used when copying data.
// Lower value generates more read/writes. No meaning having it bigger