From a4ffa9a8584bcc40ef4a842e7e2764b829607226 Mon Sep 17 00:00:00 2001 From: ae Date: Mon, 1 Sep 2014 07:34:36 +0000 Subject: [PATCH] MFC r270445: The size of the GPT table can not be less than one sector. MFC r270521: Since the size of GPT entry may differ from the sizeof(struct gpt_ent), use the size from GPT header to iterate entries. git-svn-id: svn://svn.freebsd.org/base/stable/9@270918 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/boot/common/part.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/sys/boot/common/part.c b/sys/boot/common/part.c index 55153aa4d..086809f67 100644 --- a/sys/boot/common/part.c +++ b/sys/boot/common/part.c @@ -212,8 +212,8 @@ gpt_checktbl(const struct gpt_hdr *hdr, u_char *tbl, size_t size, return (-1); } } - ent = (struct gpt_ent *)tbl; - for (i = 0; i < cnt; i++, ent++) { + for (i = 0; i < cnt; i++) { + ent = (struct gpt_ent *)(tbl + i * hdr->hdr_entsz); uuid_letoh(&ent->ent_type); if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) continue; @@ -254,8 +254,8 @@ ptable_gptread(struct ptable *table, void *dev, diskread_t dread) table->sectorsize); if (phdr != NULL) { /* Read the primary GPT table. */ - size = MIN(MAXTBLSZ, - phdr->hdr_entries * phdr->hdr_entsz / table->sectorsize); + size = MIN(MAXTBLSZ, (phdr->hdr_entries * phdr->hdr_entsz + + table->sectorsize - 1) / table->sectorsize); if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && gpt_checktbl(phdr, tbl, size * table->sectorsize, table->sectors - 1) == 0) { @@ -287,8 +287,9 @@ ptable_gptread(struct ptable *table, void *dev, diskread_t dread) hdr.hdr_entsz != phdr->hdr_entsz || hdr.hdr_crc_table != phdr->hdr_crc_table) { /* Read the backup GPT table. */ - size = MIN(MAXTBLSZ, phdr->hdr_entries * - phdr->hdr_entsz / table->sectorsize); + size = MIN(MAXTBLSZ, (phdr->hdr_entries * + phdr->hdr_entsz + table->sectorsize - 1) / + table->sectorsize); if (dread(dev, tbl, size, phdr->hdr_lba_table) == 0 && gpt_checktbl(phdr, tbl, size * table->sectorsize, table->sectors - 1) == 0) { @@ -302,10 +303,10 @@ ptable_gptread(struct ptable *table, void *dev, diskread_t dread) table->type = PTABLE_NONE; goto out; } - ent = (struct gpt_ent *)tbl; size = MIN(hdr.hdr_entries * hdr.hdr_entsz, MAXTBLSZ * table->sectorsize); - for (i = 0; i < size / hdr.hdr_entsz; i++, ent++) { + for (i = 0; i < size / hdr.hdr_entsz; i++) { + ent = (struct gpt_ent *)(tbl + i * hdr.hdr_entsz); if (uuid_equal(&ent->ent_type, &gpt_uuid_unused, NULL)) continue; entry = malloc(sizeof(*entry)); -- 2.45.0