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-rw-r--r--fs/udf/super.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 2f83c1204e20..1eeb75a1efd2 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -108,16 +108,10 @@ struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb)
return NULL;
lvid = (struct logicalVolIntegrityDesc *)UDF_SB(sb)->s_lvid_bh->b_data;
partnum = le32_to_cpu(lvid->numOfPartitions);
- if ((sb->s_blocksize - sizeof(struct logicalVolIntegrityDescImpUse) -
- offsetof(struct logicalVolIntegrityDesc, impUse)) /
- (2 * sizeof(uint32_t)) < partnum) {
- udf_err(sb, "Logical volume integrity descriptor corrupted "
- "(numOfPartitions = %u)!\n", partnum);
- return NULL;
- }
/* The offset is to skip freeSpaceTable and sizeTable arrays */
offset = partnum * 2 * sizeof(uint32_t);
- return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]);
+ return (struct logicalVolIntegrityDescImpUse *)
+ (((uint8_t *)(lvid + 1)) + offset);
}
/* UDF filesystem type */
@@ -1542,6 +1536,7 @@ static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_
struct udf_sb_info *sbi = UDF_SB(sb);
struct logicalVolIntegrityDesc *lvid;
int indirections = 0;
+ u32 parts, impuselen;
while (++indirections <= UDF_MAX_LVID_NESTING) {
final_bh = NULL;
@@ -1568,15 +1563,27 @@ static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_
lvid = (struct logicalVolIntegrityDesc *)final_bh->b_data;
if (lvid->nextIntegrityExt.extLength == 0)
- return;
+ goto check;
loc = leea_to_cpu(lvid->nextIntegrityExt);
}
udf_warn(sb, "Too many LVID indirections (max %u), ignoring.\n",
UDF_MAX_LVID_NESTING);
+out_err:
brelse(sbi->s_lvid_bh);
sbi->s_lvid_bh = NULL;
+ return;
+check:
+ parts = le32_to_cpu(lvid->numOfPartitions);
+ impuselen = le32_to_cpu(lvid->lengthOfImpUse);
+ if (parts >= sb->s_blocksize || impuselen >= sb->s_blocksize ||
+ sizeof(struct logicalVolIntegrityDesc) + impuselen +
+ 2 * parts * sizeof(u32) > sb->s_blocksize) {
+ udf_warn(sb, "Corrupted LVID (parts=%u, impuselen=%u), "
+ "ignoring.\n", parts, impuselen);
+ goto out_err;
+ }
}
/*