Limit SD card size

joltwallet · Jan 10, 2024 · 74cb038 · 74cb038
1 parent 536651b
commit 74cb038
Showing 1 changed file with 10 additions and 0 deletions.
diff --git a/src/esp_littlefs.c b/src/esp_littlefs.c
@@ -872,6 +872,16 @@ static esp_err_t esp_littlefs_init_sdcard(esp_littlefs_t** efs, sdmmc_card_t* sd
         (*efs)->cfg.erase = littlefs_sdmmc_erase;
         (*efs)->cfg.sync  = littlefs_sdmmc_sync;
 
+        size_t max_allowed_blk_cnt = 0;
+        if (((uint64_t)sdcard->csd.capacity * (uint64_t)sdcard->csd.sector_size) > SIZE_MAX) {
+            max_allowed_blk_cnt = SIZE_MAX / sdcard->csd.sector_size;
+            ESP_LOGW(ESP_LITTLEFS_TAG, "SD card is too big (sector=%d, count=%d; total=%llu bytes), throttling to maximum possible %u blocks",
+                     sdcard->csd.sector_size, sdcard->csd.capacity,
+                     (((uint64_t)sdcard->csd.capacity * (uint64_t)sdcard->csd.sector_size)), max_allowed_blk_cnt);
+        } else {
+            max_allowed_blk_cnt = sdcard->csd.capacity;
+        }
+
         // block device configuration
         (*efs)->cfg.read_size = sdcard->csd.sector_size;
         (*efs)->cfg.prog_size = sdcard->csd.sector_size;