From 2e33c5ee0b1a1ece068489e8fd99f3e4eb3501b5 Mon Sep 17 00:00:00 2001 From: bigbiff bigbiff Date: Thu, 4 Sep 2014 20:58:41 -0400 Subject: update exfat from current head Change-Id: I7d93474296612fda1dde23f6e8690668d6880e27 --- exfat/libexfat/mount.c | 75 ++++++++++++++++++++++++++++++++++---------------- 1 file changed, 52 insertions(+), 23 deletions(-) (limited to 'exfat/libexfat/mount.c') diff --git a/exfat/libexfat/mount.c b/exfat/libexfat/mount.c index 928c561dc..027f8b0e0 100644 --- a/exfat/libexfat/mount.c +++ b/exfat/libexfat/mount.c @@ -3,7 +3,7 @@ exFAT file system implementation library. Free exFAT implementation. - Copyright (C) 2010-2013 Andrew Nayenko + Copyright (C) 2010-2014 Andrew Nayenko This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -24,6 +24,7 @@ #include #include #include +#include #include #include @@ -39,6 +40,12 @@ static uint64_t rootdir_size(const struct exfat* ef) to indicate this */ rootdir_cluster = exfat_next_cluster(ef, ef->root, rootdir_cluster); } + if (rootdir_cluster != EXFAT_CLUSTER_END) + { + exfat_error("bad cluster %#x while reading root directory", + rootdir_cluster); + return 0; + } return clusters * CLUSTER_SIZE(*ef->sb); } @@ -91,7 +98,7 @@ static void parse_options(struct exfat* ef, const char* options) ef->noatime = match_option(options, "noatime"); } -static int verify_vbr_checksum(struct exfat_dev* dev, void* sector, +static bool verify_vbr_checksum(struct exfat_dev* dev, void* sector, off64_t sector_size) { uint32_t vbr_checksum; @@ -100,7 +107,7 @@ static int verify_vbr_checksum(struct exfat_dev* dev, void* sector, if (exfat_pread(dev, sector, sector_size, 0) < 0) { exfat_error("failed to read boot sector"); - return 1; + return false; } vbr_checksum = exfat_vbr_start_checksum(sector, sector_size); for (i = 1; i < 11; i++) @@ -108,7 +115,7 @@ static int verify_vbr_checksum(struct exfat_dev* dev, void* sector, if (exfat_pread(dev, sector, sector_size, i * sector_size) < 0) { exfat_error("failed to read VBR sector"); - return 1; + return false; } vbr_checksum = exfat_vbr_add_checksum(sector, sector_size, vbr_checksum); @@ -116,16 +123,16 @@ static int verify_vbr_checksum(struct exfat_dev* dev, void* sector, if (exfat_pread(dev, sector, sector_size, i * sector_size) < 0) { exfat_error("failed to read VBR checksum sector"); - return 1; + return false; } for (i = 0; i < sector_size / sizeof(vbr_checksum); i++) if (le32_to_cpu(((const le32_t*) sector)[i]) != vbr_checksum) { exfat_error("invalid VBR checksum 0x%x (expected 0x%x)", le32_to_cpu(((const le32_t*) sector)[i]), vbr_checksum); - return 1; + return false; } - return 0; + return true; } static int commit_super_block(const struct exfat* ef) @@ -201,8 +208,26 @@ int exfat_mount(struct exfat* ef, const char* spec, const char* options) exfat_error("exFAT file system is not found"); return -EIO; } + ef->zero_cluster = malloc(CLUSTER_SIZE(*ef->sb)); + if (ef->zero_cluster == NULL) + { + exfat_close(ef->dev); + free(ef->sb); + exfat_error("failed to allocate zero sector"); + return -ENOMEM; + } + /* use zero_cluster as a temporary buffer for VBR checksum verification */ + if (!verify_vbr_checksum(ef->dev, ef->zero_cluster, SECTOR_SIZE(*ef->sb))) + { + free(ef->zero_cluster); + exfat_close(ef->dev); + free(ef->sb); + return -EIO; + } + memset(ef->zero_cluster, 0, CLUSTER_SIZE(*ef->sb)); if (ef->sb->version.major != 1 || ef->sb->version.minor != 0) { + free(ef->zero_cluster); exfat_close(ef->dev); exfat_error("unsupported exFAT version: %hhu.%hhu", ef->sb->version.major, ef->sb->version.minor); @@ -211,39 +236,34 @@ int exfat_mount(struct exfat* ef, const char* spec, const char* options) } if (ef->sb->fat_count != 1) { + free(ef->zero_cluster); exfat_close(ef->dev); - free(ef->sb); exfat_error("unsupported FAT count: %hhu", ef->sb->fat_count); + free(ef->sb); return -EIO; } /* officially exFAT supports cluster size up to 32 MB */ if ((int) ef->sb->sector_bits + (int) ef->sb->spc_bits > 25) { + free(ef->zero_cluster); exfat_close(ef->dev); - free(ef->sb); exfat_error("too big cluster size: 2^%d", (int) ef->sb->sector_bits + (int) ef->sb->spc_bits); - return -EIO; - } - - ef->zero_cluster = malloc(CLUSTER_SIZE(*ef->sb)); - if (ef->zero_cluster == NULL) - { - exfat_close(ef->dev); free(ef->sb); - exfat_error("failed to allocate zero sector"); - return -ENOMEM; + return -EIO; } - /* use zero_cluster as a temporary buffer for VBR checksum verification */ - if (verify_vbr_checksum(ef->dev, ef->zero_cluster, - SECTOR_SIZE(*ef->sb)) != 0) + if (le64_to_cpu(ef->sb->sector_count) * SECTOR_SIZE(*ef->sb) > + exfat_get_size(ef->dev)) { free(ef->zero_cluster); + exfat_error("file system is larger than underlying device: " + "%"PRIu64" > %"PRIu64, + le64_to_cpu(ef->sb->sector_count) * SECTOR_SIZE(*ef->sb), + exfat_get_size(ef->dev)); exfat_close(ef->dev); free(ef->sb); return -EIO; } - memset(ef->zero_cluster, 0, CLUSTER_SIZE(*ef->sb)); ef->root = malloc(sizeof(struct exfat_node)); if (ef->root == NULL) @@ -260,6 +280,14 @@ int exfat_mount(struct exfat* ef, const char* spec, const char* options) ef->root->fptr_cluster = ef->root->start_cluster; ef->root->name[0] = cpu_to_le16('\0'); ef->root->size = rootdir_size(ef); + if (ef->root->size == 0) + { + free(ef->root); + free(ef->zero_cluster); + exfat_close(ef->dev); + free(ef->sb); + return -EIO; + } /* exFAT does not have time attributes for the root directory */ ef->root->mtime = 0; ef->root->atime = 0; @@ -314,11 +342,12 @@ static void finalize_super_block(struct exfat* ef) ef->sb->allocated_percent = ((total - free) * 100 + total / 2) / total; } - commit_super_block(ef); + commit_super_block(ef); /* ignore return code */ } void exfat_unmount(struct exfat* ef) { + exfat_flush(ef); /* ignore return code */ exfat_put_node(ef, ef->root); exfat_reset_cache(ef); free(ef->root); -- cgit v1.2.3